Hex Grids Framework

I need to render rectangle hex map but I need to hide some border tiles so the map is symetric. Is there any way to do this?
Edit: Ok, I think I can use empty tile. I hope it won’t affect performance.

Also I don’t know if it is a bug but it seems I can’t make rectangle map 5x5 when Center Map is checked. I get 4x4 map - it seems all even sizes work and odd ones are rounded down.