Albums not showing in sidebar on photos (on mac mini)

My albums have disappeared out of my sidebar. Specifically my 'shared album' and my 'My Albums' folders. I work from a mac mini.

I can still access them via the menu View > My Albums > [Option to choose 'shared album' OR 'My Albums'] but I can not see them on the sidebar located to the left - please see screenshot below showing they are not visable.

I have updated all the software while I was troubleshooting, and checked all the settings including following the instructions here on this website, but I can not seem to find why they are not showing.

I need them to show as I sort images quickly this way.

I can see the album in my sidebar on my ipad pro (I am synced between mac, iphone and Ipad), photos below to show that I can see both albums there.

I can not for the life of me find settings to adjust the sidebar and what is viewable or hidden there.

If anyone knows where it might be or how to do that, I would appriciate it.