Hi, me again!
Seems to have resolved itself. But this morning when this was happening was not the first time for me. I notice that now it has resolved I have the three circles “more options” button in the top right of each of my three panes. Before when I was having difficulties the “more options” button was only in my left hand pane. (I had one full vertical left hand pane and two panes split horizontally to the right of it).
Loving Obsidian!