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Unable to switch to Lightning
I'm using a free developer account with Trailhead but there is no option to switch to Lightning as described in the modules. Am I missing something obvious?

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If you want to switch from salesforce classic to lightning experience please find the below navigation and screenshots.
Click on the lightning Experience button which is given in the above screen shot.
Lightning Experience==>A new window opens==>Come to the bottom of the page ==>Enable lightning experience feature
After enabling the lightning experience now come to your user name on the top right of the screen, under developer console you find an option of switch to lightning experience as shown below.
Please mark my solution as the best answer if it helps you.
Best Regards,
Nagendra.P
All Answers
If you want to switch from salesforce classic to lightning experience please find the below navigation and screenshots.
Click on the lightning Experience button which is given in the above screen shot.
Lightning Experience==>A new window opens==>Come to the bottom of the page ==>Enable lightning experience feature
After enabling the lightning experience now come to your user name on the top right of the screen, under developer console you find an option of switch to lightning experience as shown below.
Please mark my solution as the best answer if it helps you.
Best Regards,
Nagendra.P
Hi Nagendra,
Great - thanks very much! Now able to switch to lightning experience.
Any help/insight on this issue is much appreciated. Thank you!
I'm also not able to switch between Lightning and Classic, however, I don't have the Lightning Experience button, I just have the Migration Assistant option.
Is anyone able to help?
How can I switch from classic to Lightening in mobile?
Please click on "Get Started" button and make sure that "Turn It On" now you are able to switch to lightning, please find image for your reference.
Thanks,
Venu E
I'm unable to see "Switching Between Lightning Experience" option in mobile view using your desktop browser and when I'm opening in mobile .view it is switching lightning experience to classic automatically.
one of my user is stuck on salesforce classic
Here is the solution for your issue,
in browser level enable the Desktop Site check box is true. this can see unter 3 dots at top right corner of the brwoser