The dialog box has reduced functionality when called from the Edit-Sheet menu of a spreadsheet.
Select first where to save the event binding, in the current document or in LibreOffice.
The big list box lists the events and the assigned macros. After you selected the location in the Save In list box, select an event in the big list box. Then click Assign Macro.
Opens the Macro Selector to assign a macro to the selected event.
Deletes the macro assignment for the selected event.