One of the things that annoys me about MMC is the inability to remove column sort orders. In particular I like the default sort order for the DNS Manager snap-in, but once a column sort order has been applied there is no way inside the MMC console to remove column sort orders to revert to the default unsorted view.
The only way to restore the default view is to remove the customisation file for the MMC snap-in in question.
The MMC snap-in preferences files are located at:
Make sure the MMC snap-in is closed, then rename the snap-in preference file by adding a suffix like “-old”. Restart the MMC snap-in and it will be reset to its default settings.