Can't edit samples individually on layered pad (Groove Agent 5 SE)

Issue: Edits applied to individual sample while in “Selected” mode are applying to all samples on the pad. Result: Cannot edit individual samples independently from each other on layered pads.
Environment: Windows 10, Cubase and Groove Agent versions: latest ( see screenshot for version number)

I’m not understanding the error at the bottom - the entire point of Selected mode is to edit the selected sample rather than the entire pad. That said, I followed along, cleared automation, and my edits are still being applied to every sample on the pad.

In the past I recall working as expected after clearing the automation (which was tedious and unintuitive) but now I can’t get it to work at all.