When I launch the sidebar, it is not showing the query associated with the current spreadsheet. It is too much work if I have to create a new query every time I want to edit them.
Thanks for your message, sorry about the issue.
The sidebar recognises a query when you choose a cell that contains query results. If it is showing the wrong query in the sidebar, please exit that query (there's an exist button and an X to close it). After that it should display the correct query.
Please note that overlapping queries often cause issues that you described. Please check the hidden sheet SupermetricsQueries, to see if there are overlapping queries on same sheets.
Heidi / Supermetrics