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Just getting the silly question out of the way - have you got an extension installed? Pretty sure it only shows up once you have an extension installed.
I am sure this is not solved yet.
We have just upgraded from InDesign 2019 to InDesign 2021 (16.3 and/or 16.2)
The Extension Sub-Menu is no longer appear anymore.
I'm having the same problem, I have an extension donwloaded but can't 'attach' it in Indeisgn