Manage your inactive picklist values and enforce limits on inactive values for custom picklists to improve system performance and overall health. You can now bulk delete inactive unused picklist values. Previously, custom picklists with many inactive values were difficult to maintain because you deleted inactive values one at a time.
Where: This change applies to Lightning Experience and Salesforce Classic in all editions.
How: Opt in to Bulk Delete Inactive Picklist Values (beta) from the Picklist Settings page. From the Inactive Values section of the picklist field, click Delete Unused Values. This feature is available only for custom picklists with predefined values.
After you delete unused values, if a picklist is unbound and the total number of inactive values falls below the limit, the picklist is set to bound.