What I have learnt to do with my iphone and google maps is don’t put in the final destination. Cos it takes you the freeway or other crap roads. I set the destination to a town or intersection along the route that I have chosen that takes me on the fun way. Once there, I then change the destination to another town along my chosen route, etc etc etc. Another way is that You can add stops and plot out the whole route, but thats annoying. I try to do the preplanning on my phone so all these destinations are saved in recent searches making them easier to find on the road. (Sometimes I forget and do the preplanning on the ipad so there is no recent searches on the phone. So thats annoying)
Everyone else in our group have Samsung phones so normally have no problems with Google maps that have been shared. I didn't plan the ride and didn't even look at the Route. If l had l would have known.