Learn how to restore the default behavior of a standard button and tab.
From Setup, click Object Manager, and then click the object that you want to update.
Click Buttons, Links, and Actions, and then select Edit from the dropdown of the desired button or tab home page.
To remove the behavior in Salesforce Classic, select No override (default behavior). To remove the behavior in Lightning Experience or the Salesforce mobile app, select Use the Salesforce Classic override.
Save your changes.
When switching from Salesforce Classic to Lightning Experience, if the URL contains nooverride=1 in Salesforce Classic, it changes to nooverride=true in Lightning Experience, and you don’t see overrides for the record you’re navigating to.
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