How do I get rid of the GREY brackets in Word 2021?

How do I get rid of the GREY brackets in Word 2021?

Here is the founded answer on the net :

Go to Word> Preferences – View to see if the box is checked for
Bookmarks. If it is, clear the check & see whether the brackets
continue to display when you close the Preferences window

But this is wrong – there is no Preferences and such that menu on word 2021.

How do I get rid of the annoying brackets in Word 2021?