You get different function controls, depending on your zoom level. Zoom in [ctl/+] and in the upper right of a forum page there will be a Plus in a box, that opens a “search tags” window. But if you zoom out to a smaller text size, the magic Plus morphs into “+new topic” in the same box, which no longer searches tags, but opens the “new topic” window instead. Zoom back in again, and the same button no longer enables a new topic. Out erstwhile webmasters have broken new ground with the power of the zoom.
Apparently, I’m the only doper with poor enough eyesight to “see” this. Iff you ever want to search tags (whatever the hell that means)), just hit zoom a few times until “new topic” disappears from the box with a plus still in it.