Problem with seting flight modes

When i set flight mode RTL , on the top of the screen RTL is written in red, with other mode it’s not the case it’s written in green. What’s the problem? i supose when i will fly it won’t work?
hat can i do to resolve this problem?

Its written in red to bring your attention that your are in RTL. Since RTL can happen without user input.

Thank you for your reply.