Revert to saved, Ctrl+Shift+O, Revert to last saved version of the current project. That is, close the current project and re-open the file.
Recent files – Contains a list of the recent files you have been working on. Recent projects can be opened directly by keeping the Alt key pressed and pressing the corresponding number indicated in the list. To the right of each recent file in the list is a button which allows you to “pin” the project. Pinned projects will remain in the top of the list until they are unpinned (by clicking on the pin button again).