Sign out of PSN.
Yes. press up on the d-pad. However, I use a G27 racing wheel and that is my default setting. I cannot speak for anyone using a controller(controller users please confirm). If you want to turn off only friends' line but retain your personal ghost, I will research thisi have not been able to find a setting for it
is it possible to turn off the racing line of those on your friends list while doing a seasonal.
it has pros and cons, but got old for me and i find it distracting when doing the trials.
The ghost/lines are all on or all of, no getting rid of the lines without your ghost disappearing. One option would be to be faster than your friends.
I don't mind the friends lines showing except they are all almost always ahead of me