What are we want to achieve by using  .toString() here isWindowed is boolean and values are not being displayed so I converted all displayed values to string
KSQL response: isWindowed is empty
1. run `show tables;`
2. <img width="911" alt="image" src="https://user-images.githubusercontent.com/1494347/171864091-37ef3ed8-549c-429c-a8f5-f041d74d3059.png">

kafka-ui-react-app/src/components/KsqlDb/List/List.tsx kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx
kafka-ui-react-app/src/components/KsqlDb/List/List.tsx kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx
diff --git a/kafka-ui-react-app/src/components/KsqlDb/List/List.tsx b/kafka-ui-react-app/src/components/KsqlDb/List/List.tsx
index 0e5ccc9facb..543aaa43f55 100644
--- a/kafka-ui-react-app/src/components/KsqlDb/List/List.tsx
+++ b/kafka-ui-react-app/src/components/KsqlDb/List/List.tsx
@@ -25,6 +25,7 @@ const headers: HeadersType[] = [
   { Header: 'Topic', accessor: 'topic' },
   { Header: 'Key Format', accessor: 'keyFormat' },
   { Header: 'Value Format', accessor: 'valueFormat' },
+  { Header: 'Is Windowed', accessor: 'isWindowed' },
 ];
 
 const accessors = headers.map((header) => header.accessor);
diff --git a/kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx b/kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx
index 59ec84095e7..e9d073bb5d5 100644
--- a/kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx
+++ b/kafka-ui-react-app/src/components/KsqlDb/List/ListItem.tsx
@@ -11,7 +11,7 @@ const ListItem: React.FC<Props> = ({ accessors, data }) => {
   return (
     <tr>
       {accessors.map((accessor) => (
-        <td key={accessor}>{data[accessor]}</td>
+        <td key={accessor}>{data[accessor]?.toString()}</td>
       ))}
     </tr>
   );
diff --git a/kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx b/kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx
index e34b3d25db5..aaf4755b0a2 100644
--- a/kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx
+++ b/kafka-ui-react-app/src/components/KsqlDb/Query/renderer/TableRenderer/TableRenderer.tsx
@@ -73,7 +73,7 @@ const TableRenderer: React.FC<Props> = ({ table }) => {
             rows.map((row) => (
               <tr key={row.id}>
                 {row.cells.map((cell) => (
-                  <td key={cell.id}>{cell.value}</td>
+                  <td key={cell.id}>{cell.value.toString()}</td>
                 ))}
               </tr>
             ))
