[sesqu]

I know the this isn't the thrust, but the "jagged pac-man" is actually supposed to be a puzzle piece, and symbolizes plugins.

The three dots at the right, for some reason, is the menu. It's labelled "Settings and more", and contains the gear icon you were thinking of, but also all of the normal menu items like new window and print. It also contains "Save page", but befuddlingly that one is hidden under another flyout menu called "More tools".

When opening a PDF file in Edge, it loads up some kind of Acrobat embedding for me, and that one has its very own "save file" button, though with identical iconography to Edge's. Thankfully, the button is visible without any further menu diving, but is also placed at the top right, with an extremely faint border delineating it from the Edge chrome.

[DidYaWipe]

Mmmm, thanks. I don't remember finding plug-in-related stuff under there. But I'll take a look tomorrow.

If that's supposed to be a puzzle piece, it's a disgrace. Just another symbol of Microsoft's abject design bankruptcy. They had far better icons than that at 16 x 16 pixels 30 years ago.

[DidYaWipe]

Sure enough, this entire button is devoted to plug-ins... which the vast majority of users are likely to have none of.

Another fine UI choice by today's Microsoft.