CLion displays the Welcome screen when no project is opened. For example, when you run CLion for the first time, or when you close the only open instance of a project. From this screen, you can, import, open, or check out an existing project from version control.
If you previously opened projects in CLion, you will see a list of these projects in the left pane of the Welcome screen. You can click any project in the list to open it, start typing to find a project, or remove any project from the list.