All Professional and Group Edition users automatically get the new UI when Lightning Experience is enabled, but users can switch back to Salesforce Classic
|Knowledge Article Number||000230643|
|Description||In Professional and Group Edition (PE and GE), when the System Administrator enables/switches to Lightning Experience, all users are automatically switched to the new interface.|
|Resolution||Despite being auto-enabled, ALL users can still switch between Lightning Experience and Salesforce Classic individually.
To switch from Lightning Experience to Salesforce Classic:
To switch back from Salesforce Classic to Lightning Experience: