To elaborate, it seems like the two buttons don't have a "checked" state like the "Studio mode" button?
I tried to edit the css for the two buttons by adding them in the .qss file
QPushButton:checked[themeID="replayBufferButton"],
QPushButton:checked#modeSwitch,
QPushButton:checked#recordButton, /*added/*
QPushButton:checked#streamButton /*added/* {
background-color: rgba(204, 5, 42, 0.5); /* new color */
border: 1px solid rgba(240, 98, 146, 0.5); /* Pink (Secondary) */
}
While the "Studio Mode"-Button now is red when active, Start Streaming and Start Recording won't take the new color.