A. Go to the app settings and look for the 'Theme' or 'Display' options. Ensure that 'Dark Mode' is selected and check if there is an option to keep the theme in offline mode. If not, try switching to light mode and then back to dark mode while connected to the internet.

B. Check your device's battery saver settings. Sometimes, battery saver modes can force apps to switch to light mode to save power. Disable battery saver or adjust its settings to allow the app to maintain its theme.