Having obstacles that block the player's vision like the trees do isn't a good idea. I'd recommend either removing them, or finding a workaround like a transparency effect if a unit is behind them.
Hi! Obstacles like trees or rocks are supposed to become transparent when a unit is behind, do you mean it didn't work for you? Have you seen there's an option in game to instantly make trees and obstacles invisible if you click on the arrow next to the end turn button ?
Anyway, thanks a lot for your feedback :)