Thank you, VikingOSX.
Yes, View>Document Only is the way to close the thumbnails and then the custom shortcut to open them again.
I began this this thread with mistakenly saying that the custom shortcut for seeing the page thumbnails had been working the day before my original post and now seemed to have broken. This is wrong, and I apologize, with the hope it didn’t confuse the matter for you.
I gather from some other digging around that I must have mistaken something else for the page thumbnails shortcut. I now think there never was one. I looked at Pages in my wife’s MacBook Pro (also on Tahoe 26.1) and saw there was not (and had never been) any keyboard shortcut for page thumbnails (i.e, she had not made one, and she said she had never viewed page thumbnails in the few weeks we’ve had our new MacBooks). Furthermore, the command in the dropdown menu itself was not toggle-able.
Until about a month ago, we had been using our old MacBook Pros (from 2014, still on Mohave 10.14) and were accustomed for years to its toggle-able keyboard shortcut for page thumbnails — we were still using Pages ’09, which I believe no longer worked in subsequent operating systems (that change from 32 bits to 64 bits). I gather from what I’ve read that when Ventura came into being, there were some number of things that had worked previously that no longer did (or worked differently), so it’s possible that’s when the command for page thumbnails was no longer toggle-able, and it had been toggle-able for Catalina through Monterey).
Be all this as it may, thank you for staying with this. Working it out has taught me some things about Pages I’m glad to know.
I do remain curious about why some commands are still toggle-able and others are not, but it’s just one of many software attributes that I’m curious about and may never come to understand.
