How to set "group messages not prompt" when busy?

There are three Group Message Settings: "Receive and Prompt", "Receive, but not Prompt" and "No Group Messages". You can select "Receive, but not Prompt" when busy and check group chat records after work finished. Steps are as below:

Click "My Group" after login TradeMesseger, double-click the group chat window, and then select accordingly in "Group Settings", as shown below:

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