Selecting an instrument – Single mouse click on the instrument (a thin red box will appear around the instrument)
Deselecting an instrument – Click anywhere on the panel template (not on another instrument)
Grouping Multiple Instruments – Single mouse click on the instruments you wish to group and then click on the Group Icon from the top tools menu
Ungrouping Instruments – Click on the group of instruments and then click on the Ungroup icon from the top tools menu