yeah these changes have always been like that, no news there.
Still not sure what you are trying to use card-mod theming for. Ofc, I dont have Bubble theme, but for the hiding of the sidebar, you can easily use Kiosk-mode plugin. No need for theming at all, just flip the toggle and you’re set.
Because there are a lot of those cards with same style setting, I’d like to set this style in theme.
Can you help me, how to set this style in the theme style setting?