Freeroam question

Is there a way to pick another engine to drive in freeroam after you've already started to drive your first engine?
I've tried clicking on another engine but it won't let me switch to it. The little hand icon won't show.
So I'm not sure if this is possible or if I'm not doing something correct.
Thanks.
I've tried clicking on another engine but it won't let me switch to it. The little hand icon won't show.
So I'm not sure if this is possible or if I'm not doing something correct.
Thanks.