Man pages matching name al_reset_new_display_options in section 3alleg5:

al_reset_new_display_options.3alleg5.en	debian 10 / allegro5-doc
al_reset_new_display_options.3alleg5.en	debian 11 / allegro5-doc
al_reset_new_display_options.3alleg5.en	debian 12 / allegro5-doc