Explanation
Page layout editor is a tool that allows you to customize the layout and organization of detail and edit pages for a specific object and record type combination. You can use page layout editor to make fields editable or read-only on page layouts for different profiles or record types. After resetting a password, the user may be required to activate their device by entering a verification code sent to their email address or phone number before they can log in to Salesforce. This is a security feature that helps prevent unauthorized access to Salesforce from unknown devices or browsers. References:
https://help.salesforce.com/s/articleView?id=sf.customize_layoutedit.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.identity_verification.htm&type=5