When using the expandable data view in the Layout Editor, hidden columns are still visible. Yet the Hide column action is available. Clicking Hide column from this position is a very weird UI - it appears to do nothing, yet the column is now hidden in the Data Editor.
It would be great to hide the columns in the Layout Editor as well. Plus the ability to search columns in the Layout Editor would be super helpful. Accessing data in the Layout Editor is very handy for troubleshooting, but these changes would make it so much easier! Especially when the column count is high.