How You Can Hide 'Switch to Salesforce Classic' Option in Salesforce Lightning
Hello Salesforce Wizards!
We cannot hide switch to Salesforce Classic option for any Standard profile like Standard Use or System Administrator. It is only possible with custom Profiles. Just follow a few simple steps to hide this feature and continue with the Salesforce Lightning Experience.
Step 1 - Click on Setup.
Step 2 - Search "Profiles" in the Search box and click on Profile option
Step 3 - Click on the "Edit" button on a custom profile.
Step 4 - On the Profile Edit page, under "Administrative Permissions" select the checkbox "Hide Option to Switch to Salesforce Classic". To enable this, "Lightning Experience User" is mandatory, select that and Save the changes.
Thanks, keep reading.