As per the issue description mentioned above, you want to disable the pop-up which appears when launching Acrobat, is that correct?
Would it be possible to share the screenshot of the issue with us? To share the screenshot here in the forums, refer to the steps given in this link: https://forums.adobe.com/docs/DOC-7043#jive_content_id_How_do_I_attach_a_screenshot
You may also visit the following forum thread and see if this is related to your issue:
Also, could you confirm the application - Reader or Acrobat you are using on the machine?
The screenshot in reply #18 on the other thread you refer to is it precisely, so there's no need for an additional screenshot. I am using Acrobat Pro DC, version 2019.008.20080. As you can see, the pop-up covers the top two tools completely, and must be dismissed before they can be used.
Thanks for the info. At the moment, it isn't possible to customize the Share button. Please file a feature request for the form via the link below: Feature Request/Bug Report Form to make the Share button customizable.
Please also see the link - What's new in Adobe Acrobat DC on the capabilities introduced by the Share button.
Looks like the exact request I would make is already up there, so there's no need to do more than upvote it. One hopes Adobe takes the request seriously; it's clear many users have issues with the so-called "big blue share button" and would like to see its presence made optional at a minimum.
Thank you for your time; I suppose we can consider this question closed.