Select elements to export, group, etc...

Press once on the header area to select an element. Repeat to select multiple elements. To deselect an element, press on it again. 

An alternative is to press on the element's context menu icon, and choose "Select".

Protobi context menu for question Q1 showing dropdown menu options: 'Select', 'Copy as text/html', 'Copy as image', followed by keyboard shortcut options including 'Round by... (E B)', 'Statistics... (E S)', 'Color... (E O)', 'Format... (E F)', 'Recode... (E R)', 'Filters... (E I)', 'Chart type... (E H)', 'Edit properties... (E M)', and 'Edit JSON... (E J)'. On the right side, a partial view of a horizontal bar chart showing percentages (5%, 68%, 15%, 6%, 3%, 1%, 1%, 1%, 100) for a question about antagonist patients