To select individual entries, click on one or more entries from the Listed Table list and press the small right arrow button.
To de-select individual entries, click on one or more entries from the Selected Table list and press the small left arrow button.
To select or de-select all entries, press the large blue or black arrows respectively.
You can select more than one table by holding the Ctrl-key down while clicking on the desired entries. You can select a group of consecutive entries by clicking on the first table you wish to select and then clicking on the last table while holding the Shift-key down.