Application.AllowAutoQuit

From Xojo Documentation

Property (As Boolean )
aApplication.AllowAutoQuit = newBooleanValue
or
BooleanValue = aApplication.AllowAutoQuit

New in 2019r2

Supported for all project types and targets.

When True, the application quits when the last window is closed, whether by calling the Close method of the Window class or by the user closing the last window manually.

Notes

AllowAutoQuit defaults to True on non-MDI Windows applications and True on Linux. It defaults to False on MDI Windows and macOS applications.

Sample Code

This code is in the Open event of the App class.

App.AllowAutoQuit = True