Time to get rid of the classics :-)
- From Setup in Lightning Experience, enter Lightning in the Quick Find box, then select Lightning Experience Transition Assistant.
- Select the Optimize phase
- Click Turn Off Salesforce Classic for Your Org to expand the stage.
- Turn on Make Lightning Experience your org’s only experience.
Users see Lightning Experience the next time they log in to Salesforce. They no longer see the Switch to Salesforce Classic link.
