When i click on the 3 bars to open or close the sidebar in the library, the icon changes color but nothing happens to the library. Toggling this icon seems to have no effect other than to change its color.
That often indicates that the column is too narrow to see. Try enlarging the screen and see if a column becomes visible for resizing. - I'm not a Mac person so my terminology may be wonky.
Thank you, MJ. That was the problem. Not sure how it got shrunk, but all is good now.
John, what did you actually DO to unshrink that column? I'm on a MacBook Pro with Logos 8 and all are up-to-date. Thanks.