In editor, trigger activation is now unavailable either in 2D and 3D;

Edit : looking for a workaround, I have found :
1° it happens only when "Normal" option is set on Interface Size.
2° it happens only if "Resolution" is set on native 1680x1050 (16:10) resolution of the screen.

So ATM, Arma3 Editor can't be use with Normal settings of this IiYama ProLite B2206WS.