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I have assigned one permission set to user to enable lighting experience.
Please note Hide Option to Switch to Salesforce Classic is unchecked (false) and also at profile level this checkbox is false.
Still when logged in as the user, I am unable to see option to switch it to classic .
If this is happening for all users, then you can check if this below setting was enabled
Go to Setup > Click on Lightning Experience Transition Assistant > Click on Go To Steps on Optimize Phase i.e. 3 step > Open Motivate Users to Work in Lightning Experience section > Check if Make Lightning Experience your org's only experience setting is enabled
If the above setting is enabled, then disable it, log out from Salesforce, clear your cache and history of browser and login again and then try switching back to classic.
