The Three-Dot Menu

While settings for your current website are accessed via the menu in the left-sidebar, there are several general Publii app options that can be accessed via the Three-Dot Menu, which is located at the very top-right of the app window. Clicking on the three-dot icon will open a new menu with the following options:

App Settings - Clicking on this item will take you to the App Settings screen, where you can modify general elements of Publii such as storage locations, default behaviour, and load-on-start options.
Themes - Displays the themes currently available in your Publii installation, and allows you to remove them by clicking on the Trashcan icon. You will also see a link to Get more themes, which will take you to the Theme Marketplace where you can purchase premium themes for Publii or download additional free themes.
Plugins - Displays the plugins currently available in your Publii installation. As with themes, these can be removed by clicking on the Trashcan icon next to the name. By clicking on the Get More Plugins button, you'll be taken to the Publii Plugin Marketplace, where you can download new plugins from the full range currently available.
Languages - In this section you can see and set the language used in the Publii app by default simply by clicking on the relevant language icon (Publii comes with both an English and Polish translation as standard). By clicking the Get More Languages button, you can open the GitHub page that contains any community-translated packs that can be downloaded and installed in the app.
Help - Clicking this option will open a browser window to this very document, where you can find info on all the features of Publii!
Report an Issue - If you've encountered a bug, or need some assistance with using Publii that is not covered in the documentation, click this option to open your browser to the Publii Forums, where you can report issues and get help with building your site.
GitHub Repository - Opens a browser window to Publii's GitHub Repository, where users can request features, contribute to development or just check in to see what features are being worked on.
Donate - Happy with Publii's features, and want to contribute to its ongoing development (or just buy the dev team a coffee)? Click this option to be taken to the Publii Donate page, where you can find multiple ways to support this project.
About Publii - Click this option if you want to know some basic details about what powers Publii, and get information on licensing.