Let the user toggle light/dark mode

[enrique-lozano]

Problem to solve

Currently the app switches between light mode and night mode automatically based on the system mode. It would be a good option to let the user decide if he wants to always have the light or night mode always active.

Possible solutions

I think the best thing would be to add a select in the general settings section, with three options: automatic mode, light mode and night mode.