Trying to get rid of them but can't find a way to in the options, managed to activate them when I started playing the game but...
Restarted the game several times yesterday ans this morning. Changed several times track and car but they don't disappear with the option shown on my previous post.
@Andi Goodwin was so friendly to test this in current public build for us, and found no issues turning these markers on or off. Just to be sure, are you clicking the "apply" button after you made the change in settings?
Found ! My option screenshot above was not in the good section, I had to click on "personnal parameters" in video settings. Did not remember at all where it was. Thanks for the answers !