Related Questions:
Why Isn't my Document Template visible in my other Organization?
Can I copy my Document Templates from one Organization to another?
Procedure:
Click on your Organization name at the top right of your screen
Press Multi-Organization
In the left-hand Menu, Click on Settings
Click on Templates, Document Templates
Change the Organization Filter to where the Document Template is Located
Click on the Edit button on the right-hand side next to the Document Template you want to show Chain-wide
At the top-left of your screen, next to Permission, click on the Organization name, and set the Permission to Chain
Press Save
Additional Information:
Organization-level Templates are visible to everyone in a specific Organization and are editable by the Template Owner and Organization Administrators only.
Chain-level Templates are visible to everyone in the Chain and are Editable by Chain Administrators only.