The map editor is in Zone mapping mode, zone viewing/browsing submode.

F2 switch to picture mode
F3 switch to passability mode
F4 switch to door placement mode
F5 switch to NPC placement mode
F6 switch to foemap mode
F7 switch to zonemap mode

M to switch to zone editing submode

Use the arrow keys to move around the map.

Use SHIFT+arrow keys to move around the map faster.

Use ALT+arrow keys to move the view of the map.

Move the cursor around the map to see which zones each tile is in. Up to 8 zones can be displayed at once. Other, nonvisible, zones are displayed with a haze that fades in and out. Press S to disable this effect.

Press - and + to move the cursor in the menu at the side of the screen. PGUP, PGDOWN, HOME, END keys also work.

Zones are automatically made visible when you move the cursor over them. Press A to disable this.

Press H to hide a zone if it is too distracting. Hidden zones are made nonvisible. This has no in-game effect.

Press L to lock a zone so that it'll continue to be displayed regardless of where you move the cursor.

Press E to edit to go to the zone info editor, where you can edit the triggers attached to this zone.

Press T to change the tilemap used.

Pressing TAB toggles a minimap showing the selected zone, and what part of the map you are currently looking at.
