Keep Record Context When Switching from Salesforce Classic to Lightning Experience

When you switch from Salesforce Classic to Lightning Experience, you land on the same page in Lightning Experience, if it exists. If the same page doesn’t exist in Lightning Experience, you are redirected to your default landing page, which is determined by the org default or your customizations.

Where: This change applies to Lightning Experience and Salesforce Classic in Group, Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.