Missing Native resolution for second monitor

Hi there,

I’ve been playing hots on my iMac screen for a while and it’s been working well. I’ve recently connected a gaming monitor of mine to the imac and was hoping to play heroes on there instead, however the native resolution of that monitor (1920x1080) doesn’t appear in the list of resolutions.

I’ve reset the game settings and even uninstalled and re-installed the game but I’m having no luck.

Someone on Reddit linked to this which supposedly had the fix, but this post appears to have dissapeared: https://us.battle.net/forums/en/heroes/topic/20753266773#post-1

Can anyone help at all?