Row Groups will automatically open to show the rows in the parent group - irrespective how levels deep the Row Groups are.
But sometimes the only columns in the Grid are the Row Groups - when this happens you see a strange effect in the last group of empty rows with no content.
To avoid this set hideEmptyGroupRows to true in General Options and the last row will not expand when clicked.
In this demo we have set hideEmptyGroupRows to true and created 2 Layouts:
- Many Columns - has multiple columns and the last row not opening effect is not required
- No Columns - has no non-grouped columns so the last group will not open