In the Database, under Tilesets, select the panel with your tileset you want to edit (A/B/C/D/E). Notice that there are X and O on the tiles? X means it's the same level as the player, and O means underneath. If the Tilemap is under B/C/D or E, you can also set it to a Star to place that tile above the player.
To make a Worldmap tile above the player, you need to also place it under B/C/D or E.