How to turn off the green markings of friendly units. How use periscope ?

[pcplayer]

 

I'm struggling with the setting.
How to turn off the green markings of friendly units around. I also want to turn off all green mission target signs.
I need to find a button to turn off allies and mission objectives.
Thank you
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How to turn on the periscope ?
How does a German periscope slide out of a German tank??

Edited April 17, 2022 by pcplayer

[Jegz]

To turn the markers off  either disable them in the difficulty setting before you launch a mission, or you can toggle them on and off (if they are enabled) with the 'I' key. 

 

To use the periscope I think you need to use the  'nestle to visor' keybind. It may also need opening with open visor command. I'm not near my computer to check.