Couple of questions, need some help.

[Sneaksie]

You can turn icons on and off simply by pressing F1 if i'm not mistaken.

Did you try F4 damage info overlay, do you find it useful?

Are you sure that recoiless rifle is immobile, devs say you can move it?

{Units (notably field guns and mortars, but also tanks, probably everything...) do not respond to the Hold Fire command. To make them cease fire it is necessary to give them a movement order, wait until they start to move, and then order them to halt. This is not good for game immersion.}
- Just give them Hold Fire and the Stop, they won't start firing again until you remove Hold Fire.