Now changing on it's own WOULD be disconcerting
At first I really had issues with the camera picture disappearing while it changed views when I use the signal !!! so knew I had some adjusting to do!
First,
I adjusted my side view cameras (which are out front on the mirrors thankfully) so that I can see all the way down the blind spot sides
(this wouldn't work as well if side cameras are on the coach body and not out front on the mirrors)
And from experimenting with the camera views, have found that with the mirrors adjusted for the sides, the rear camera alone is enough for me to tell me when I have enough clearance to move over - even with the toad !
Much less stressful with them adjusted like it is.. good luck on your fix !