This screen allows you to select a maptile to use in the map editor. Use the arrow keys to highlight a maptile, and press ENTER or SPACE to choose it.

Hold down ENTER or SPACE and move the cursor to select multiple tiles to paint with as a brush for the Clone tool. All the tiles will be placed on the current map layer when painting with this brush.

Hold SHIFT to move the cursor faster.

Press A to toggle whether animated tile sets (if defined) are
shown below the tileset (scroll down). By default they aren't.