Hello,

When you view "Resource Planning" with the "Show Project Level" option (access to additional settings), the project levels appear normally.

Then, if you collapse all the levels with the "-" button (Collapse all groups) and expand them with the "+" button (Expand all groups), the project levels appear briefly and then disappear.

This is not the case if you expand using the "+" button located next to the resource name. In this case, the projet levels appear normaly.

Version is 12.1.1.

Have a nice day,
Lionel