I tried to browse be genre documentary. If there is subgenre, it was well hidden and did not shown up on my tablet.

Oh, and apparently documentary genre means also action movies. I don't know why there were also action movies.

Oh, and the more you browse the more it shows the same movie again and again.

Oh, and when I click on thumbnail, then the list jumps back to start, forcing me to browse the same movies again.

I ended up watching YouTube.