Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Troubleshooting Characters walk through trees, how do it stop it?

I,ve managed to get somewhat of a grip on the editor with old videos of the first editor and some videos of the new.

I,ve gotten so far that i have build a few houses and som rocks and trees.

I generate the ai grid and then i test it out.
Buildings and rocks are non passabel but the trees are like air and my characters can walk right trough them.

How do i Fix this? do i have to do it manualy or are there som autogenerated setting i don't get?

Thanks any who know and want to share.