Posts from Illuminating different parts of the dungeon.
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See “How to switch the editor to advanced mode.”
I usually do it this way. I place any static object, like a stone, and then replace its shared property with the one I need. It's the easiest way. Just click the three dots and choose from the list.
In the advanced editor menu on the left, you can work with them, but it's usually more convenient for creating mods (changing object properties or creating new ones).