Check Spelling Before Sending A Message - Microsoft Support

Manage the Editor suggestions in new Outlook

As you compose your email, Microsoft Editor provides a real-time tally of suggested edits. This number appears below the email composition area. When no suggestions are identified, the Editor icon appears in the same location.  ... ...  Selecting either of these icons will open the Editor panel. 

You can disable the display of the Editor suggestions count as follows. 

  1. In the new Outlook ribbon, select the (...) overflow menu.

  2. In the overflow menu list, select Editor.

  3. In the adjacent list, select Hide suggestions count.

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