Consider adding an option that will enable users to save a preferred set of columns that they can easily apply to multiple snapshots.

This will ease users' work by testing different scenarios based on different sets of snapshots.

Currently (version 6.3.0), a custom column is added to all opened snapshots only during their initial creation. However, to add/remove already created columns in multiple snapshots explicitly, one will have to go through each separate snapshot, which is not convenient and is time-consuming.