@onotole f.lux actually modifies this setting for activation at sunset. Then I assume it sets the "dark theme" back to unchecked, once sunrise happens. It's probably enabled by default in f.lux, so look in the settings there first.

Which operating system version are you using and installing?

Hi there, Just wondering how to disable ''uncheck for currrent app''. Can someone help me? Can't figure it out. Thanks in advance Gijs