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Trailhead Org Navigation Bar is missing
HI,
I'm unable to view any Tab in my Trailhead Org's Home Page (in Lightning view only, with classic its all fine). I think i messed up the settings while customizing the Home page in a trailhead challange. Need help , I have finished many challanges in this Org only. So creating a new org is off the table. Thanks in advance.

I'm unable to view any Tab in my Trailhead Org's Home Page (in Lightning view only, with classic its all fine). I think i messed up the settings while customizing the Home page in a trailhead challange. Need help , I have finished many challanges in this Org only. So creating a new org is off the table. Thanks in advance.
Sorry for this issue you are encountering.
May I suggest you please check with below blog post which has step by step explanation which should help you further with the above issue.
- https://pritamshekhawat.wordpress.com/2016/02/27/customize-salesforce-lightning-navigation-menu/
Please let us know if this helps.Kindly mark this as solved if the reply was helpful.
Thanks,
Nagendra