Can't using other powerwashers/equipment in bonus or DLC?

So i recently started to play this relaxing game, last time i end career mode, so now i have to do the bonus jobs, but i noticed apparently you can't equip stuff you bought it

Is this for all the bonus jobs and even DLCs (i have all of them)? Not a big problem, just...weird, so wanted to know

Also i hope if you play in freemode you can use whatever you want, both in career jobs/bonus jobs or special-dlc jobs

if someone can clarify how this works i will be glad, thanks in advance

EDIT: oh ok, so free play mode is only for career and DLC stuff? But will i be able to use the upgraded equipment? (same for the DLCs)