By Default, the Greeting Dialog will display on Desktops, and hide on Mobile Devices
Show – The greeting dialog will always be shown when the plugin loads.
Fade – The greeting dialog will be shown when the plugin loads, then fade away and stay hidden afterward.
Hide – The greeting dialog of the plugin will always be hidden until a user clicks on the plugin.
The Show, Fade, Hide option will work until the user Changed the things.
If the selected option is “show”, When the user clicked on close the greetings dialog, it will be hidden until the user clicks the messenger icon again.