Why doesn't active tracking work ("V" key)?

Good evening,
for quite some time, the (very practical) “V” key to activate active tracking no longer works, I changed the key assignment, nothing happened, no more yellow marker 😪…have you ever had this issue ? I remember that this had already happened to me, and by reinstalling the game completely, it worked… but if there was another way I’m interested… (maybe I forgot to check/ activate an option or an item?) Thank you in advance 🙂