Open project opens new window

Hi, when I "open project" it normally opens a new sublime window for the new project. This is great when I'm juggling multiple projects at one time. However, when I have no project "open" and I go to project -> open, it still opens the new project in a new window. IMO it would be a lot easier if it just opened the project in the same sublime window (but only if there isn't already an existing project open).