How to make top panel light again?

[fossfreedom]

Also look at this

Theming changes in UB 22.04 and later

Lets try to answer some of the theme issues being raised around various forums. GNOME 42 brings libadwaita and the enforced dark & light styling using just libadwaita colours - i.e. you cannot use your own GTK Theme. Anything else you may read in this area is a hack. Fortunately only a few apps in 22.04 are libadwaita based … but you will see many more in 22.10. Also - libhandy based apps similarly have this dark & light styling … but it only recognises the users dark or light GTK+3 theme if t…

For light themes you need to tweak the described gsettings key.