How to set Planify app run in background after quitting window

I find the planify app doesn't run in background after quiting windows. However I have allow it to run in background in app's settings. Only after log in again can it run in background. And I find no way keeping it background after just quitting the window. The vesion is zorinos 18. Any help?

You could change the Exec= line in the .desktop file to

Exec=planify &

The ampersand instructs the application to run in background.