Every project you create is saved into your current workspace. When you want to open a saved project, select it from the project switcher in left side of the top bar.
Projects are listed in the order they are created (newest at the top of the list).
Type a value into the box to find a project by name.
Click the project name to open it.
Enterprise accounts can also open projects from their home Space.
Every project gets assigned a unique URL. You can also open a project by navigating to the bookmarked URL any time.