How do you unlock 4th and 5th map? I've beaten 1-3 and don't know

Unlock the first favorite slot by completing all non-unique maps in the region ; Unlock the second favorite

The fifth slot in the Map Device is now unlocked upon completing a non-Valdo's Tier 17 Map forumview-thread

poe 5th map slot Kill the green marked Bosses and get the fifth Map Slot

poe unlock 5 slot map device You can unlock the fifth slot by completing a map opened when you put 4 timeless emblems in the map device Helps when you want to run with