You can see all the recent queries that have been run on a database in one place to easily identify long-running and expensive queries.
Go to Settings.
Click on the database name in the sidebar. You'll be able to see a Users tab and a Recent Queries tab.
The Recent Queries tab will show any query run on any schema or table which has been loaded into Select Star. It will not show queries for tables or schemas that have not been loaded into Select Star or that have been removed from Select Star.
You can click on these queries and get more detailed information the same way you would from a database table page.
Clicking on a table in the right sidebar in the query details page will take you to that table page.