Removing the Add-on
Revoke AccessTo remove add-on, please visit your Google Account permissions page. Then, simply "revoke access" to MarkdownTableMaker.
Google Sheets Add-on RemovalIf you installed a G Suite Marketplace add-on in addition to the same Chrome Web Store add-on during the editor add-on migration, then you may have "two instances" of the same add-on installed.
One instance may be in Google Chrome Web Store, and the other one may be in G Suite Marketplace. As a result, you may try to remove an add-on using the Google Sheets interface with no success.
Here is an example of such unexpected behavior:
G Suite Marketplace Add-on RemovalTo remove the add-on, you may need to use the G Suite Marketplace. Access the "Manage Apps" menu, then remove the MarkdownTableMaker add-on.
RemovedNow, the MarkdownTableMaker add-on should be completely removed.
If you want to re-install the MarkdownTableMaker for Google Sheets add-on, simply use G Suite Marketplace.