Symbols logo have a purple square in no layer

Hi, I have some (a bit annoying) boxes where I have symbol footprints that appear to be in no layer:

Removing all layers:

Is it possible to remove those purple boxes from the view?

Thanks!

That’s locked item shadows. You can disable them here:

Your items are locked.
You can either unlock each area with RMB Select > Locking and unlock (making sure Locked Items are ticked in the Selection Filter), or, if you just wish to hide the purple without unlocking the items, go to RHS Appearance manager > Objects > Locked Item Shadow and turn off the purple by clicking on the “eye” to hide the color.

To get an even faster answer in future:

image