I'm going to show you how to change the type of a tile - from a word tile to a category tile or vice versa.

To do this, first make sure edit mode is enabled. Go to settings and toggle the appropriate switch.

Then you can press the three dots of the tile whose type you want to change. Let's say you want to make "hello" a category: press the three dots, scroll down a bit and toggle the switch from word to category. In the preview you can already see that an arrow appears. Press save in the top right and the tile will be converted to a category.

Want to make it a word tile again? Then go back to the three dots and toggle the switch back. Note: you can only convert a category to a word tile when it contains no underlying tiles. Do you have tiles in the category? Remove or move them first before making the conversion.

Press save and the tile becomes a regular word tile again.