The maximal number of items shown in a query result can be set in the form for the query options. The default value is set to 100. If you have a fast connection to your database or need to see more or less results, you may change this value to any number you like. Furthermore you may set a limit for drop down lists in the query, that will lead to the creation of lists depending on the entries in the database.
To change the displayed fields for searching specimen click on the 
button. This opens a form where you can select and deselect the
fields you want to be shown for searching specimen. Here you can change the
maximum numbers of items that will be shown in the list. If you want certain
fields to appear in the query options select or deselect them in the list.
After editing the query options click OK so the new selection will become active for the next query.