Repeating group inside the Repeating group's Cell does not Collapse

Need help
1

I am trying to make a menu list with multiple layer looks something like this: (click on “>” in the left menu) https://wrappixel.com/demos/angular-admin-templates/admin-pro-angular/main/#/component/accordion

But the issue is Repeating group inside the Repeating group creates unnecessary space which is supposed to be collapsed when there are no data in the cell. Is this a bug?? This is what I made by now.

Preview:

Edit:

Please help if somebody knows how to collapse the height in the cell.
Thanks.

2

You have to place the inner RG in a group. Then set the group to collapase

3

Thanks @AliFarahat .

Ok, I placed the inner RG in a group and checked "Collapse Element’s height when hidden. But, it seems
the issue still remains. Unable to collapse the empty cell. Am I missing something?? Thank you again.

4

I managed to make it work by grouping the RG. This is how it looks like. Thanks @AliFarahat

Preview:

Edit: