You mean changing from the super dark AMOLED theme to the dark theme that's on the official RU-vid which is more gray than fully black? If so, I'm not sure.
@@REALJonathan5675 Amoled theme allows high contrast ratios & deep blacks, as well as vibrant colors... This type is unavailable for LCD panels.. so check bout ur panel ... And also youtube not offers Amoled theme ! Just dark theme...
The video control where you change the quality of the video like 720p or 1080p? On the video press on the gear icon, go to Quality, go to Advanced and select a quality option from there. If you want it to be applied automatically on every video, go into ReVanced extended settings until you see video and change the default video quality on Wi-Fi network option there.