AW2725DF, Alienvision issue, crosshair turns OFF

Hey there, I'm using Alienvision - Crosshair feature. but whenever I alt+tab from the game (Fortnite) to Desktop, I get a message on the screen that Alienvision was turned "OFF". Anyone having this issue or knows how to fix?

I have customized the crosshair through Alienware Command Center - could this be the fault?

Thanks!