I have a problem. I don’t know why it happens, but sometimes the first line of my code gets marked orange. This is very annoying because I can barely read it as you can see in this image.
Try to reset all settings in Roblox Studio settings. If that doesn’t work, the only way as much as I know is to click Return at the start of the first line then scroll down 1 line to make it disappear. I’ll try to find more solutions to see how this can be solved.
Check if you have “New Luau Type Solver” enabled in your Beta Features, accessible through the FILE menu at the top-left. If it is, try disabling it and restarting Studio.