iOS 18 but

1 . I have recently downloaded iOS 18 and my phone is on dark mode but on somethings, things are on white / light mode. Is there any way too fix this? I’ll post some screen shots showing my problem.

That's the app icon for a third-party app and is unlikely to have been updated for the new version of iOS - and even if YouTube have already updated the app, it certainly will not be released before iOS 18 is released.

iOS 18 but
 
 
Q