@ovasileva I agree that the content width does get very narrow when the two sidebars are visible, so hiding one of them sooner would make the article more readable within that zone of 1200–1000px.

Personally I have a preference for hiding the page tools first as I would give priority to the ToC, so would opt for something around the area of this option:

below 1200px, margins get narrower
below 1200px, page tools gets auto-hidden
below 1000px, toc gets auto-hidden

That said @TheDJ makes a good point about the page tools being visible being an active choice of the user so people may expect that to remain visible. So that might be something to test?

Two thoughts:

• I think we decided to collapse the sidebars at 1000px initially because it seemed like a reasonable width, and we already had a breakpoint there. But I think that number is worth reevaluating. Maybe the interface actually works reasonably well with the content + a sidebar at widths below 1000px? The sidebar column is perhaps more narrow than is ideal, but the reading experience seems reasonable and the added utility of having a visible TOC (or page tools menu) is perhaps significant. In all honesty we haven't yet spent much time thinking about the ideal layout at smaller screen sizes (including how elements in the site header respond), so flagging that as an area for more exploration.

You go from wide, to very narrow and then really wide again...it's sizing shouldn't make such a big jump...

• I think we should be thinking about key screen sizes that people will be using, and providing the best experience at those widths. I don't think it's particularly important how it feels as you transition between those key screen sizes, because that seems to be a fairly negligible part of your actual experience. Like yes, it might be a little weird, but ultimately you're using a static version of the interface, so what happens along the way seems kinda whatever.

below 1200px, margins get narrower
below 1001px, page tools get auto-hidden
below 1000px, toc gets auto-hidden

FYI, the inconsistency between page tools and TOC was a bug that was fixed with T331168, they should both get auto-hidden at 1000px