The query drawer shows your recent queries (under History) and allows you to store and organize frequently used queries. The query menu includes options to create and rename folders. Drag & drop can be used to rearrange queries.
When a query is selected, you can use Edit->Delete to remove it, press the Edit button to open it in the Query Editor or press the Execute button to perform the query. You can also drag & drop a query into the Query Maker.
The Query Drawer can be hidden or shown by either the toolbar button or by selecting Show/Hide Saved Queries from the Query menu.