This occurs because all website navigation ability is turned off in the 'Edit' mode.
To close the popup, switch to the 'Preview' mode from the 'Edit' mode using either the Preview button, or the 'Esc' key on your keyboard. You will be able to close the popup in this mode after which you can re-enter the edit mode using the 'Edit' button or the 'Esc' key to resume editing your component.
If you face any other issues, contact us at email@example.com.
I'm not able to close the popup on the Visual Editor.
How to close a pop up in the Visual Editor?