Remove react-grid-cell cell border
MODIFY
app/components/Settings/Preview/sql-table.css
app/components/Settings/Preview/sql-table.css
/* fix horizontal overflow issues */
.react-grid-Cell {
box-sizing: border-box;
+ border-right: none !important;
}

MODIFY
app/components/Settings/scheduler/scheduler.css
app/components/Settings/scheduler/scheduler.css
/* fix horizontal overflow issues */
.scheduler-table .react-grid-Cell {
box-sizing: border-box;
+ border-right: none;
}
.scheduler-table .react-grid-Row {

Remove react-grid-cell cell border