If you would like an extension you have added to the Brave browser to have an icon at the top of a Brave browser window, you can "pin" it to the right of the address bar in the browser by clicking on the icon that looks like a puzzle piece that appears to the right of the address bar, which will result in a list of installed extensions appearing, and then clicking on the pushpin icon for an extension that you would like to be "pinned" so that an icon for the extension appears to the left of that puzzle piece icon, allowing you to click on the extension's icon to use the extension. E.g., for the Evernote Web Clipper extension shown below, if I click on the pushpin icon next to it, an icon for the Evernote extension than appears next to the puzzle piece icon.