org-agenda-persistent-marks

org-agenda-persistent-marks is a variable defined in `org-agenda.el'.
Its value is

nil

Documentation:
Non-nil means marked items will stay marked after a bulk action.
You can toggle this interactively by typing `p' when prompted for a
bulk action.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.