How do I open two or more projects at the same time in Android Studio?

Question

In Android Studio, I want to open another project, so I click File -> Open, but the original project has been closed.

What should I do to open the two projects at the same time?

Answer 1

To open multiple projects simultaneously in Android Studio,
go to Settings > Appearance & Behavior > System Settings,
in the Project Opening section,
choose Open project in new window.

Answer 2

Umh,I have solved my question. First,I try to click the File->Find Action and search 'open new project'.Then I find a result and enter the settings window:Project opening.(So sad I have no reputation to post a picture) Select the first check box.