Activating a project opens the project URL and switches to the view mode or preset that you chose while creating the project. In addition, you'll see the bookmarks, todos, and notes linked to the project (if any).
To activate a project, click the 📖 Projects icon and select the project that you want.
While a project is activated, you'll see it on the top of the projects list with the label Active.
If you specified a local folder and/or a code editor while creating or editing a project, you can open it in your file explorer or preferred editor by hovering over the project name and clicking the respective icon.