I normally have my layer box columns arranged in the following order:
Current, On, Lock, Color, Name (all the rest off)
i.e. the name is not the first column.
Installing the latest update (7.12.21285.17001, 2021-10-12) made everything go back to default with all the columns showing. In addition, after re-arranging and resetting everything as I wanted, the linetype column is shown even though it is unchecked in the editor:
A restart of Rhino cleared the last problem. Seems just a bit glitchy to me though.