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Mary Myers 15 Lightning experience not in developer mode
I see the box to the left in setup to enable lightning but after I enable it it doesn't change anything the setup button does not change to the gear icon so it's almost impossible to do the challenges
you need to switch lightning experience.
if your problem is not solved,then follow "Lightning Experience Migration Assistant" on left side in setup page.
Hope to have helped!
Don't forget to mark your thread as 'SOLVED' with the answer that best helps you.
let me know if any issue occured.
Regards.