Love the game so far, but I find it quite cumbersome that there is no way to know if my ranged characters will be in range of an enemy before I move them around.
I suggest that when you move your character it shows a small icon near (or a colored border around) an enemy if you can hit them. Possibly the icon could be added to the turn order images on top of the screen if one wants to avoid cluttering the battlefield with icons.
XCOM2 did something similar to this:
The red crosshairs icon next to the enemy healthbar indicates that you can fire on that enemy with your basic attack. There is also a mod that makes it yellow instead if that position is also considered to be a flanking shot.
Naturally aoe abilities etc can not be previewed like this, but having something for your basic abilities should help a ton for those weird angles and heights where you can't be sure if you can hit them or not.