Well you can switch tunes in freeroam but before applying the new one ,before even clicking on the tuning menu the game tells you that it will remove the previous tune. Which takes ages to load in and just might as well have a tab where u can go straight up to all your tunes and switch immediately without having to remove the current one.
That’s basically what I was saying.
When in Freeroam, you only get the tune car option - i.e re-tune from scratch - but no switch tune to another that you already own.
In the freeroam pause menu - creative tab there’s a tunes button on the right. It brings up the search tunes option, but you can tab (RB) to the right to get to your locally saved tunes.