Once an organization has enabled Lightning Experience, Users with the Lightning Experience User permission may toggle or switch back and forth between Lightning Experience and Salesforce Classic at any time using the steps below.
If you do not see the option to switch to Salesforce Classic, this has been turned off by your Salesforce Administrator or you have one of the restricted versions listed in the following notes.
Important Notes:
2. Click Switch to Salesforce Classic
Note: In the Salesforce Classic view, you can also find the Switch to Lightning Experience to the left of your name.
Note: Running Classic and Lightning Experience in different browser tabs or windows is not supported and can cause unexpected behavior in the look and feel of your org and the values returned by the $User.UITheme and $User.UIThemeDisplayed fields. For example, if your org is using Lightning Experience, but you switch to Classic in a different browser tab, these fields return a Classic theme in both tabs.
For a visual guide, see our "How Do I Switch Between Classic and Lightning?" screencast on YouTube.
'Switch to Salesforce Classic' not available after upgrade from Essentials Edition
Considerations for Switching Between Lightning Experience and Salesforce Classic
Users can't see the option 'Switch to Salesforce Classic'
Salesforce Classic Mobile App Retirement
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