Man pages matching name set_display_switch_mode in section 3alleg4:

set_display_switch_mode.3alleg4.en	debian 10 / allegro4-doc
set_display_switch_mode.3alleg4.en	debian 11 / allegro4-doc
set_display_switch_mode.3alleg4.en	debian 12 / allegro4-doc
set_display_switch_mode.3alleg4.en	debian 13 / allegro4-doc