Currently viewing of the execution plan is little cumbersome, it is not readily available as it did previous incarnation of the MetaMatrix Designer. Currently, the user needs to right click on the query and select "Teiid_7.1 --> Query Plan" see the query plan.
When a query is executed, the statement executed has the query already associated with it, so there is no good reason for user to take yet another step before they can see the query plan. It should be automatically populated in the "Execution Plan" tab when the query is executed. Or provide tool bar button on the "SQL Results" panel, that will take user to the "Execution Plan" of the current query. In case of query plan not available this tool bar button could be greyed out.
Since the query plan is in XML, show it in XML editor (read-only), that will let the user collapse or expand the the nodes to see and understand it, otherwise these are rather long, could be confusing to scroll.