Increase available horizontal space when reading Wiki pages

Problem to solve

I have some tables in my Gitlab project wiki pages that are a bit wide. I know that a horizontal scroll bar appears, but it would be nice to have "hide/unhide" buttons on right sidebar so that I can view the entire wide content. (There is a collapse button for left sidebar, would be nice to have the same on the right sidebar.)

Proposal

Hide, collapse, or otherwise minimize the sidebar to temporarily increase the usable horizontal width of the Wiki page.