|Available in: Group, Professional, Enterprise, Performance, Unlimited, and Developer Editions|
The Switch Users to Lightning Experience tool is available from the Lightning Experience Migration Assistant in Setup. In the Migration Assistant, click the Set Up Users tab, then click Switch Users.
Search the user list to find exactly the user you want (1). See at a glance which users have permission to access Lightning Experience and are eligible to switch (2), which users have already switched (3), and which users can’t be switched because they don’t have the Lightning Experience User permission (4).
To switch users to Lightning Experience, click the button next to their names.
Unlike before, you can’t use this tool to switch users back to Salesforce Classic. But users can switch themselves back as needed, using the Switcher in their profile menus.