None of my foldouts will open up (you click on the arrow and no drop down occurs) in 2019.3.0f3 but they all work just fine in 2019.2.17. Did something change with the way foldouts work in the editor that I missed in the update notes? It has something to do with "= EditorGUILayout.Foldout(___, "_____"); never changing in value when the dropdown arrow is clicked. Using a static fyi in case that matters: public static bool m_PresetFoldout; Once I change that to true the foldout appears, but again the toggle arrow doesn't work at all and it will never toggle to false. Same script works as expected without problems on 2019.2.17, so was wondering if this was a bug or a deliberate change somewhere and if any other users are experiencing any issues with foldouts. Thanks!