Can't fill staircase sides I need to fill this side and then other side of staircase, but tools I used don't work. Tools like Bridge Edge Loops, Grid Fill and Fill always make nosense mess like if there wasn't the same amount of verteces, but I checked it and there should be right number.
I use Blender 2.80.

My thought is the problem do that pointing verteces on every step of starcase, but still don't know how to do that.
With Edge Loops, when I unselect edges on sides.
I'm not sure there would be any automatic way to fill the side, you could do it this way: enable the Snap (Vertex mode) and the Auto-merge options, select the vertical raw of vertices and then make successive extrusions on the Y axis, it will automatically snap and merge.