Side windows don't show

Mac OS Ventura 13.1 SketchUp Pro 23.0.366. Recently I’ve encountered an issue whereby when I open a file in SketchUp, the normal array of side windows (e.g. Tags, Entity Info, Components, etc.) doesn’t appear. I have to quit SketchUp and then re-start to get the side windows to show. I don’t recall for sure but I believe it started doing this even before I installed SketchUp 23.

Is this a known issue or am I messing up somewhere?