When modifying the column widths on a saved view, there is no prompt to save or revert the view as is normally seen upon updating a saved view as seen below
Release : SAAS
Component : AGILE CENTRAL
This behavior has been observed for views that were migrated from the old user interface to the new user interface on the Backlog page
At this time, the recommendation is to recreate the view. Making a copy will not work as it copies the inherent issue preventing the update of column widths.