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Click Admin Dashboard, as marked in figure.
Click Controls, as marked in figure.
Scroll the vertical scroll bar.
Click Auto-Delete (Chat History).
Select Enable.
Choose your preference to Delete history for every Day, Week, Month, or Year, as shown in the figure.
Click ‘Every Day at’ drop-down menu and select AM or PM.
Click ‘Time Zone’ drop-down menu and select your time zone preference.