The mobile site for logged in users who have opted into the "Advanced mobile mode" via the settings cog in the left e.g. https://commons.m.wikimedia.org/wiki/Special:MobileOptions now displays categories in the case way as desktop as part of the work we're doing to simplify the mobile site (T246049). This was done to allow gadgets to run on mobile as they do on desktop, for example HotCat.
Projects may want to consider enabling these gadgets on mobile as historically they have only run on desktop: