The extension allows you to configure the toolbar button as a shortcut for quickly searching with a single search engine or a group of search engines. The toolbar button opens a popup by default, where you can select a search engine, and there is also a button for opening the extension's options.

Though that's not the standard way of accessing a browser extension's options, it was just added to the popup as a convenience. All browsers have buttons for opening options on the management pages of extensions. Visit about:addons to open the options page of your extensions.

Searching with images from the clipboard is already supported, please read the extension description.

Google Lens is already supported, you can enable the search engine from the extension's options.