I started learning SQL in VSCode via the SQLTools plugin. I tried to connect to MySQL database sakila via the "Add New Connection" button of the SQLTools plugin. On the first 2 tries, I pushed the "Save Connection" button before the connection was OK (even the database was not set up properly then). I expected the connections (even if they are broken) to appear in the connections list (near the "Add Connection" button), but nothing appeared there. On the third time, I created a working connection. Unfortunately, after saving it, it did not appear in the list as well. Now an annoying pop-up with the error "Element with id ... is already registered" (see exact message print-screen below) keeps appearing constantly.

- Where are these elements (mentioned in the error message) registered in (in which file, etc.)? They are not present in VSCode's
settings.json. Is there some other place? - How to get rid of the pop-up with the error message?
- Why did the correct connection not present in the list of connections even if I can run queries via it (find the print screen below)? How to fix this? In this video tutorial the connections appeared in the list automatically.

