Appearance: light, dark and system
Settings → Appearance. On phones the app restarts to apply the change.
Open Settings → Appearance and choose System, Light or Dark. System follows your device. On iPhone and Android the app restarts briefly to apply a manual choice and returns to Settings.
Did this answer it?
Still stuck? Tell us what you tapped and what happened at contact@ksspsolutions.com. A screenshot helps. There is also a Suggest a feature button at the bottom of every screen in the app.