Custom labels are globally available to use in Apex, Process Builder, Formula Fields, and WorkFlows. If you can not see your custom label in the List of all custom labels try to change the ListView to ALL.
Hope it helps, Let me know if the Problem still Persists.
You can navigate to Quick find ---> Custom Label.
Please check 'List view' of 'Custom Label'.
Custom Label:
https://help.salesforce.com/articleView?id=cl_about.htm&type=5
Hope above information was helpful.
Please mark as Best Answer so that it can help others in the future.
Thanks,
Vinay Kumar
Custom labels are globally available to use in Apex, Process Builder, Formula Fields, and WorkFlows.
If you can not see your custom label in the List of all custom labels try to change the ListView to ALL.
Hope it helps, Let me know if the Problem still Persists.
Thanks and Regards
Ayush Sharma
Once you have refreshed the page you'll find the newly created resources.