Salesforce desktop and mobile apps have separate setup options.
Add LearnUpon to the Salesforce mobile app
Salesforce Classic: Navigate to Setup > Mobile Administration > Salesforce Navigation.
Salesforce Lightning Experience: Navigate to Setup > Apps > Mobile Apps > Salesforce > Salesforce Navigation.
- From Available list, locate LearnUpon.
- Highlight LearnUpon and select Add to move the tab to Selected list.
- Use the up and down arrows to re-order your navigation menu, as needed.
- Save to finish.