How can one change the battery saver to dark mode in Android 9 (Samsung Galaxy S9)? I use Samsung Galaxy S9 with Android 9.

Screenshot from the Google Drive Android application, which seems to indicate that it is possible to change the theme in the battery saver:



How can one change the battery saver to dark mode in Android 9 (Samsung Galaxy S9)?
The "Set by Battery Saver" option only means that the app's theme is determined if Battery Saver is enabled or not.

The Battery Saver itself does not have its own theme, but apps can query if the setting is enabled or not for customizing its behavior, including the theme.

On Google Drive (and some other Google apps, and possibly 3rd-party apps), this setting means that if Battery Saver is enabled, then use the theme that saves battery (e.g. dark theme).

To summarize:


Dark: always use the dark theme
Light: always use the light theme
Set by Battery Saver:


If Battery Saver is off: use the light theme
If Battery Saver is on: use the dark theme