Once support for Windows 10 native notifications is released, users who choose to use Windows notifications will be able to utilize Windows OS specific settings for the length of time to display notifications. Mac does not have an OS specific setting, so will not have the support.
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I searched out this forum because I'm constantly missing Teams messages. So I'm adding my two cents in the hopes in encourages the development of something to make notifications stand out. I vote for a popup that stays on your screen until you acknowledge it. Thanks for listening!