Hello @gabrieljones, thank you for suggestion.

I personally find this behaviour useful, especially  when you need to send similar messages with minor changes. Maybe we can add explicit "Generate random" button in produce dialog. 
We will discuss it internally and implement it either way. 

cc @Haarolean @workshur 
 To do:
1. In the produce message pane add a new checkbox "Keep the contents", unchecked by default
2. If the checkbox is being checked, upon producing a message do the following:
1) do not close the pane upon producing the message
2) Do not alter key/value content in any way
do we need the `div` tag here ? isn't submit happening any how , `if (!keepContents) {}` should only act on the values without the `onSubmit` where it should be outside of the condition, cause the request is already being carried. @Mgrdich this function is not mine, as I understand it, it only closes the sidebar, I will rename it we do not need div then we can delete it. yeah i want to understand when we should trigger that close thing , cause from only reading of it , the request the BE is happening  -> so logically `onSubmit` should work, `if (!keepContents) {` `setValues` is what is happening to the ui state of the component.

if it is not onSubmit handler then it should be renamed
Don't Dismiss Produce Message pane after `Send`
### Which version of the app are you running?
vv0.4.0([521ba0c](https://github.com/provectus/kafka-ui/commit/521ba0c))

### Is your proposal related to a problem?
After clicking `Send` in Produce Message pane UI shift back to the Messages pane and resets the Produce Message field contents.

### Describe the solution you'd like
After clicking `Send` in Produce Message pane UI stays on the Produce Message pane and the field contents remain as entered without being reset to a new random lorem ipsum.

kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts
kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts
diff --git a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx
index 483c41d0533..d2750abf7d1 100644
--- a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx
+++ b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.styled.tsx
@@ -8,15 +8,29 @@ export const Wrapper = styled.div`
 export const Columns = styled.div`
   margin: -0.75rem;
   margin-bottom: 0.75rem;
+  display: flex;
+  flex-direction: column;
+  padding: 0.75rem;
+  gap: 8px;
 
   @media screen and (min-width: 769px) {
     display: flex;
   }
 `;
-
-export const Column = styled.div`
-  flex-basis: 0;
-  flex-grow: 1;
-  flex-shrink: 1;
-  padding: 0.75rem;
+export const Flex = styled.div`
+  display: flex;
+  flex-direction: row;
+  gap: 8px;
+  @media screen and (max-width: 1200px) {
+    flex-direction: column;
+  }
+`;
+export const FlexItem = styled.div`
+  width: 18rem;
+  @media screen and (max-width: 1450px) {
+    width: 50%;
+  }
+  @media screen and (max-width: 1200px) {
+    width: 100%;
+  }
 `;
diff --git a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx
index 9450e512ad1..bacfa76c93f 100644
--- a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx
+++ b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/SendMessage.tsx
@@ -4,6 +4,7 @@ import { RouteParamsClusterTopic } from 'lib/paths';
 import { Button } from 'components/common/Button/Button';
 import Editor from 'components/common/Editor/Editor';
 import Select, { SelectOption } from 'components/common/Select/Select';
+import Switch from 'components/common/Switch/Switch';
 import useAppParams from 'lib/hooks/useAppParams';
 import { showAlert } from 'lib/errorHandling';
 import { useSendMessage, useTopicDetails } from 'lib/hooks/api/topics';
@@ -26,9 +27,12 @@ interface FormType {
   partition: number;
   keySerde: string;
   valueSerde: string;
+  keepContents: boolean;
 }
 
-const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
+const SendMessage: React.FC<{ closeSidebar: () => void }> = ({
+  closeSidebar,
+}) => {
   const { clusterName, topicName } = useAppParams<RouteParamsClusterTopic>();
   const { data: topic } = useTopicDetails({ clusterName, topicName });
   const { data: serdes = {} } = useSerdes({
@@ -47,11 +51,13 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
     handleSubmit,
     formState: { isSubmitting },
     control,
+    setValue,
   } = useForm<FormType>({
     mode: 'onChange',
     defaultValues: {
       ...defaultValues,
       partition: Number(partitionOptions[0].value),
+      keepContents: false,
     },
   });
 
@@ -62,6 +68,7 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
     content,
     headers,
     partition,
+    keepContents,
   }: FormType) => {
     let errors: string[] = [];
 
@@ -110,7 +117,11 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
         keySerde,
         valueSerde,
       });
-      onSubmit();
+      if (!keepContents) {
+        setValue('key', '');
+        setValue('content', '');
+        closeSidebar();
+      }
     } catch (e) {
       // do nothing
     }
@@ -120,7 +131,7 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
     <S.Wrapper>
       <form onSubmit={handleSubmit(submit)}>
         <S.Columns>
-          <S.Column>
+          <S.FlexItem>
             <InputLabel>Partition</InputLabel>
             <Controller
               control={control}
@@ -137,47 +148,58 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
                 />
               )}
             />
-          </S.Column>
-          <S.Column>
-            <InputLabel>Key Serde</InputLabel>
+          </S.FlexItem>
+          <S.Flex>
+            <S.FlexItem>
+              <InputLabel>Key Serde</InputLabel>
+              <Controller
+                control={control}
+                name="keySerde"
+                render={({ field: { name, onChange, value } }) => (
+                  <Select
+                    id="selectKeySerdeOptions"
+                    aria-labelledby="selectKeySerdeOptions"
+                    name={name}
+                    onChange={onChange}
+                    minWidth="100%"
+                    options={getSerdeOptions(serdes.key || [])}
+                    value={value}
+                  />
+                )}
+              />
+            </S.FlexItem>
+            <S.FlexItem>
+              <InputLabel>Value Serde</InputLabel>
+              <Controller
+                control={control}
+                name="valueSerde"
+                render={({ field: { name, onChange, value } }) => (
+                  <Select
+                    id="selectValueSerdeOptions"
+                    aria-labelledby="selectValueSerdeOptions"
+                    name={name}
+                    onChange={onChange}
+                    minWidth="100%"
+                    options={getSerdeOptions(serdes.value || [])}
+                    value={value}
+                  />
+                )}
+              />
+            </S.FlexItem>
+          </S.Flex>
+          <div>
             <Controller
               control={control}
-              name="keySerde"
+              name="keepContents"
               render={({ field: { name, onChange, value } }) => (
-                <Select
-                  id="selectKeySerdeOptions"
-                  aria-labelledby="selectKeySerdeOptions"
-                  name={name}
-                  onChange={onChange}
-                  minWidth="100%"
-                  options={getSerdeOptions(serdes.key || [])}
-                  value={value}
-                />
+                <Switch name={name} onChange={onChange} checked={value} />
               )}
             />
-          </S.Column>
-          <S.Column>
-            <InputLabel>Value Serde</InputLabel>
-            <Controller
-              control={control}
-              name="valueSerde"
-              render={({ field: { name, onChange, value } }) => (
-                <Select
-                  id="selectValueSerdeOptions"
-                  aria-labelledby="selectValueSerdeOptions"
-                  name={name}
-                  onChange={onChange}
-                  minWidth="100%"
-                  options={getSerdeOptions(serdes.value || [])}
-                  value={value}
-                />
-              )}
-            />
-          </S.Column>
+            <InputLabel>Keep contents</InputLabel>
+          </div>
         </S.Columns>
-
         <S.Columns>
-          <S.Column>
+          <div>
             <InputLabel>Key</InputLabel>
             <Controller
               control={control}
@@ -191,8 +213,8 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
                 />
               )}
             />
-          </S.Column>
-          <S.Column>
+          </div>
+          <div>
             <InputLabel>Value</InputLabel>
             <Controller
               control={control}
@@ -206,10 +228,10 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
                 />
               )}
             />
-          </S.Column>
+          </div>
         </S.Columns>
         <S.Columns>
-          <S.Column>
+          <div>
             <InputLabel>Headers</InputLabel>
             <Controller
               control={control}
@@ -224,7 +246,7 @@ const SendMessage: React.FC<{ onSubmit: () => void }> = ({ onSubmit }) => {
                 />
               )}
             />
-          </S.Column>
+          </div>
         </S.Columns>
         <Button
           buttonSize="M"
diff --git a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx
index 609324b8f09..35137ef8643 100644
--- a/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx
+++ b/kafka-ui-react-app/src/components/Topics/Topic/SendMessage/__test__/SendMessage.spec.tsx
@@ -49,7 +49,7 @@ const renderComponent = async () => {
   const path = clusterTopicPath(clusterName, topicName);
   await render(
     <WithRoute path={clusterTopicPath()}>
-      <SendMessage onSubmit={mockOnSubmit} />
+      <SendMessage closeSidebar={mockOnSubmit} />
     </WithRoute>,
     { initialEntries: [path] }
   );
diff --git a/kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx b/kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx
index 8945523576b..0022e002a73 100644
--- a/kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx
+++ b/kafka-ui-react-app/src/components/Topics/Topic/Topic.tsx
@@ -236,7 +236,7 @@ const Topic: React.FC = () => {
         title="Produce Message"
       >
         <Suspense fallback={<PageLoader />}>
-          <SendMessage onSubmit={closeSidebar} />
+          <SendMessage closeSidebar={closeSidebar} />
         </Suspense>
       </SlidingSidebar>
     </>
diff --git a/kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts b/kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts
index 710a85a86c1..4ccb4ae0b73 100644
--- a/kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts
+++ b/kafka-ui-react-app/src/components/common/SlidingSidebar/SlidingSidebar.styled.ts
@@ -6,7 +6,7 @@ export const Wrapper = styled.div<{ $open?: boolean }>(
   position: fixed;
   top: ${theme.layout.navBarHeight};
   bottom: 0;
-  width: 60vw;
+  width: 37vw;
   right: calc(${$open ? '0px' : theme.layout.rightSidebarWidth} * -1);
   box-shadow: -1px 0px 10px 0px rgba(0, 0, 0, 0.2);
   transition: right 0.3s linear;
