Enable Dark Theme On Devices

Android devices

Can reduce power usage by a significant amount (depending on the device’s screen technology).

https://developer.android.com/guide/topics/ui/look-and-feel/darktheme

Linux Mint

Linux Mint Menu (lower left) > System Settings (on left column) > Appearance > Themes > Appearance, choose Dark.

Windows 11

Settings > Personalize > Colors > Choose your mode: Dark.