The Settings button can be found in the More menu on the Zoom Meeting Controls toolbar.

A screenshot of the Zoom meeting More menu.

Clicking the Settings icon opens the Settings menu.

A screenshot of a Zoom meeting with an open Settings menu.

From here you can select from a variety of sub-menus. If you click Open all settings (at the bottom of the menu), you will open the full Settings menu.

A screenshot of the Zoom meeting Settings menu.