Hi Guust,
Just noticed you reply after adding the comment above.
I’d tried doing it with css, problem I had was my nav’s sub-menus overlap the map when it is normal size, so when I change the z-index of my menu the map is on top / overlapping the sub-menu when the map is normal size.
If I move the z-index the other way, the nav shows when the map is full screen.
The method above seems the easiest way, as it adds a new class to the map when it is full screen.
Cheers, Craig