code/__DEFINES/action_button_defines.dm

SCRN_OBJ_DEFAULT	Whatever the base action datum thinks is best
SCRN_OBJ_FLOATING	Floating somewhere on the hud, not in any predefined place
SCRN_OBJ_IN_LIST	In the list of buttons stored at the top of the screen
SCRN_OBJ_IN_PALETTE	In the collapseable palette

Define Details

Whatever the base action datum thinks is best

Floating somewhere on the hud, not in any predefined place

In the list of buttons stored at the top of the screen

In the collapseable palette