Nice! I need to check out U Block.
uBlock is unrelated. What you want is uBlock Origin.
To do permanent cosmetic blocking of part of a page, click on the uBlock Origin icon, click the eyedropper thing, move the mouse around until the largest possible region of unwanted material is highlighted, click, move the mouse to the lower right corner, and then click "Create". Repeat until as much of the page as you want to erase is gone. If you screw up or want to undo it, go the the "My Filters" tab on the uBlock Origin dashboard and manually erase the rules you don't want to keep.