A couple three problems with the percussion dialog in version 4.5.2

Percussion dialog in version 4.5.2 can be resized to non-existence:

You can resize it even thinner, at which point there is no trace of the dialog. You can make the dialog wide again by clicking and dragging at the approximate location of the invisible dialog.

The dialog title bar characters overlap upon resizing of the dialog:

In this image, you'll have to look closely. But if you open a percussion dialog in 4.5.2, you'll see what I mean.

And, the Customize kit option leads back to a slightly changed percussion customize dialog which I find just as infuriating as the original. There has to be a better way than that. But that's just my pet peeve, your mileage will vary.

(as a side note, brackets and braces are still not able to have names, but that should be filed under something else I don't know what at this point.)

OS: Windows 11 Version 2009 or later, Arch.: x86_64, MuseScore Studio version (64-bit): 4.5.2-251141402, revision: ac9d3bc