Select Delete
Query 
from the Query
menu.
In the Plan View, use the mouse to select the queries you would like to delete. NOTE:
The Delete Query option can be used to delete queries.
To use Delete Query:
Select Delete
Query from the Query
menu.
In the Plan View, use the mouse to select the queries you would like to delete. NOTE:
You can select Point Queries and/or Line Queries
You can select individual queries or click and drag a selection window to select multiple queries.
When you are finished selecting, press Enter or right-click and select Done Selection, and the selected query(s) will be deleted.
Right Click Shortcut
Delete Query is available as a right-click shortcut for individual queries:
In the Plan View, right-click the mouse on a Point Query or a Line Query, and the query will be "selected".
Select Delete Query from the popup menu and the query will be deleted.