If the player is a squad-leader, then every his subordinate soldier has the hexagon framing. I always wanted to disable this framing in my squad, because it's not realistic. These framing are visible through any objects and the player can see their soldiers through the walls and any objects!
I searched, how I can remove it, but not found the personal settings. Unfortunately the game has no personal settings for this purpose.
I found only one way.
If you go to -> Configure/Game/Difficulty and turn off "Extended HUD info", then this hexagon edging disappear, But even this doesn't work perfectly!
It will work only for infantry, but as soon the player gets inside the vehicle, then the player will still see the hexagon framing of their subordinates. See the screenshots.

Please fully remove these hexagon framing if the player disables "Extended HUD info" or give any option to fully disable it.
It is necessary for more hard core and realistic missions. {F26573} {F26574}