FYI, for those interested, you can't simply remove fields from the grid using customizer or deleting the M4L. (I wanted to reset a field to include a lookup after adding UDT validation, but for the life of me I could not figure out why it was not working). Look in SY_GridDefinition for the UDF lines. Because I resized the screen, it created company specific lines in that table, which were overriding the ### versions with the correct settings.
(Normally I love SQL / Premium, but tracking down what files are changed when doing something rare is not easy).