Looks like nothing happens when switch theme to Grey Amber.
Hi, I’ve just tested this here and the grey/amber theme is working for me.
color schema doesn’t change in my case.
update:
it works after I go to settings and manually choose grey amber in interface dropdown, I was trying to switch through hamburger menu but it didn’t work.
Just did that. Selected three different themes then back to Grey Amber via Hamburger menu. All on iPhone.
You might want to state which browser and platform you are using and if you see any errors in the javascript console upon selection?
I am on windows chrome, and it works fine for me.