Layout Grid disappears after a frame is rotated.
This is normal. Don’t rotate frames which contain layout grids, this will not only hide grids but also create a lot of other probably unwanted side-effects. Generally speaking you shouldn’t rotate frames at all, but there are exceptions to this. If you want to change the orientation of a frame, use this button:
Yeah, that makes sense. Thanks for pointing out the portrait button. The Layout Grid doesn’t disappear if I use that to rotate the frame.