Chosen Solution

Hi so I asked about this already and my stupid self didn’t think of capturing the pic with another device instead of screen capping it so I have to asked again can anyone see this reddish tint that’s like a line and can you tell me what it is and what to do?

I can’t really tell but it’s probably the screen suffering from burn-in which is a very common issue on OLED screens in general, it’s been like this since Samsung Galaxy S2. To fix this it would require replacing the screen which would not be worth it, the only way to mitigate screen burn-in is to avoid letting the phone display e.g the notification bar / on-screen keyboard for long periods of time, but even with that it will still appear over time. If the phone is less than two years old from purchase / manufacturer date whichever is newer it would be under warranty from Samsung for a screen replacement.