Prerequisite
Make sure that the check box Confirm window to open project in in the General page of the Settings dialog is selected.
-
Open a project, while another one is already opened. PyCharm
prompts you to select whether you want to open the project in a new window, or reuse the existing window.

- Do one of the following:
- Click Open in new window button to leave the current project in its window and open the new one in a separate window.
- Click Open in current window, and select the check box Add to currently opened projects.
Tip
Clicking Open in current window without selecting the check box Add to currently opened projects results in closing the current project and opening the new one in the same window.

