On the left is the list of texts. Each one has an "x" so that it can be deleted separately from all the others. It seems to be hit and miss, but there are times when I click the "x" on one text and they all disappear! This has never happened before.

Originally Posted by joemikeb
Are these texts with the x on their corner in the Messages application or are they appearing at the upper right corner of your screen? If it is the latter...
  1. navigate to System Preferences > Notifications & Focus > Notifications
  2. scroll down the list of apps in the left hand pane and click on Messages
  3. at the bottom of the right hand pane in the Notification grouping drop down menu, select OFF


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