al_reset_new_display_options - Allegro 5 API

       This undoes any previous call to al_set_new_display_option(3alleg5) on the calling thread.

Allegro reference manual                                                   al_reset_new_display_options(3alleg5)

       al_reset_new_display_options - Allegro 5 API

              #include <allegro5/allegro.h>

              void al_reset_new_display_options(void)