When trying to customize the toolbar in the Mac Mail app under BigSur beta (all betas thru bate 6) some items can be moved, others can not, and still others don't appear to show at all, such as flexible spacing. I assume this is just a development bug, but am wondering if anyone else has experienced this issue. Also, there is no "tag" for Mac Mail in these new forums.

Does anyone know if a way to change the font size used in the Xcode navigator on the left edge (not the source code editors)? It appears to be maybe the same font used in the Utilities area on the right edge of the screen.The editor section fonts I know how to change. Its the small fonts on the sides that puzzels me.Thanks,Charles