Refitting
Refit after every structural change
Off: Collapse, Ungroup, Set reference and the shapes wait for the Refit button, so you can make several in one go.
Keep the reference level when collapsing
The reference stays where it is. Collapse it into a group and that group becomes the reference.
Display
Follow the browser's light or dark setting
On until you choose a theme in the top bar.
Diagnostics
Request timings
How long the last refit and each panel took.