Running Mint-MATE,18.3, 4GB RAM. All of a sudden, in bottom panel,Left clicking on Menu button, when opens,displays in vertical listing 8 items-from Accessories to System Tools. Left clicking on any of these 8 items then displays all items in that category. When I Right click on the Menu button,it brings up the Edit Menu which shows the categories.I really would like to get back the "regular" display, showing Terminal, etc., on left side, and then Favorites, etc., on right side..I have run everything I thought pertinent in Control Panel, and also in CompiWiz, all to no avail.I even did a reboot ,clicking on Recovery, but still same problem. Please let me know how to repair this, short of a clean reinstall, which I plan to do in very near future, when Mint 19 comes out.I originally posted the problem in the Mint forum, and hydrurga was very helpful, but we couldn't solve this one.He suggested I repost here. Also, the screenshot is how the taskbar looks now.
I'd appreciate any, and all suggestions. Thank you.

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tosim, I suggested that you repost on the Linux Mint forum at https://forums.linuxmint.com/ , not here.

Actually, I was sure I posted in correct place; evidently not. Here is where I just re-posted:
https://forums.linuxmint.com/viewforum.php?f=206
Once again, thanks.

No problem. Let's hope someone can help you out with this (let us know either way).

Will do.