Procedures window shows all methods in the selected class, all procedures, which are not part of any class, or all procedures from the selected unit.
Click on a procedure name to select it and display its source in the Source preview window. Click a checkbox next to the procedure name to mark/unmark it.
Click checkbox next to the <all procedures>/<all classles procedures>/<all TXXX methods> item to mark/unmark all procedures, all procedures that are not part of any class, or all procedures in class TXXX.