I'm on a Mac and I've checked settings, clicked on the hamburger sign, searched the forum, restarted, logged, etc., but can't figure out how to get the filter/sidebar back. Here is a picture of my library with no sidebar...thanks.
Assuming that by hamburger you mean the three horizontal lines to the left of the input box with the cursor, clicking the hamburger is how you toggle the sidebar. If you were indexing or still preparing the library, I suspect that you simply didn't wait long enough for it to come up.
Thanks, MJ. Yes, I waited for indexing to stop...and yes that's the icon I am referring to. It doesn't toggle. I am almost finished with a reinstall and hoping that's going to fix the problem. Thanks for chiming in.
Which specific version of the app engine are you running? The most current release version (as of this post) is 8.8 SR-1.