Windows in gallery view stuck

Hi, my gallery view suddenly shrank and became smaller squares with up to 4 on the same row squeezed next to each other  ie whether I have 2, 3 or 4 participants thee gallery view display them all on 1 row rather than on 2. 

I also no longer can move the order of the windows for each participant. 

I tried reinstalling but does not help. I have that issue only with Samsung Tab s6 lite whether I am the host or guest. It is functioning normally on all my other devices. 

Has anyone encounter this issue and found a solution?