Script request

I'm not sure what's causing it, but, in my mobile browser, the Forum contents box is so wide it pushes the Saloon bar's own table of contents down, making the Saloon bar much more difficult to navigate, especially on a tiny screen. Like so:

If it's not too much trouble, could you craft a script to make it... not do that? Like, hide whatever element is causing that? Apologies if I'm asking for too much.

Probably some really long section titles forcing the widths above 50%