Saving changes to a custom data view is currently batched together with changes to the site itself:

When initially creating the view this level of gravity is perhaps warranted. However, when you're temporarily adjusting an existing view it feels a bit heavy-handed. Generally these are 'softer' edits that you wouldn't expect to persist. For example when you view Trash in wp-admin the date filter is inactive, regardless of whether you previously filtered by date or not.

We might consider the following adjustments to the save flow for custom views;

1. Including a "Save" action in the view menu.
2. Indicating the view has been customised somehow.
3. Not alerting the user of unsaved changes when navigating away.

A rough mockup:

cc @WordPress/gutenberg-design