Q: Option to show sidebar in Photos on Mac is greyed out.

But here is a weird thing. I tried your method and I can not find my house icon.  I have seen it and used it dozens of times before.  I can not find it now.

If the house icon for the home folder is not showing in the Finder sidebar, change the Finder preferences.

Bring the Finder forward by clicking somewhere on the empty desktop. Then open "Finder > Preferences". In the preferences panel click the sidebar tab and enable all options you want to show in the sidebar, i.e. the home folder.

Thank You!  Easy !

Oh my god thank you!!!!

That worked like a charm. Thank you so much!

just make the size of the windows on photos bit  bigger it should pop up by itself ok i just did on mine ok