leftmost

left most |ˈlef (t )ˌmōst ˈlɛf (t )ˌmoʊst | ▶adjective [ attrib. ] farthest to the left: the leftmost edge of the screen.

leftmost

left |most |ˈlɛftməʊst | ▶adjective [ attrib. ] furthest to the left: the leftmost edge of the screen.