The main menu in Arma 3 cuts off the selections to the left. Also, in-game HUD cuts off too. (hides behind the bezel)
This happens with bezel corrected resolution. 6008x1080 (for my specs) rather than 5760x1080
I think most people run their games with bezel correction, so you may want to move those over just a bit more to compensate.
Agreed with Rolexman.
The ingame menu HUD shouldn't be offset from the left monitor by a standard monitor resolution but rather should be centered depending on whatever bezel corrected screen resolution is ran.
An update, as I was incorrect previously and it seems the issue is that the GUI seems to be stretched to 1/3 of the screen width including bezel correction, rather than being limited to say, a 1920x1080 resolution in the centre of the screen. Hence some of the GUI elements, such as ammo counter, are behind the bezel.
Please, send us a screenshot, where the issue is visible, together with more accurate description of how to reproduce the issue. When reporting please refer to "how to guide" http://feedback.arma3.com/how-to-user.html.html. Thank you.
Closing due to lack of info/response.
If this issue is still reproducable for you, please create a new ticket for it and be sure to include all necessary info/files.