Welcome to Adobe Express Community!!
Users can use the 'Make a Template' feature to make any project a template and add it to the desired library.
- You must be on the 'Project' tab to use this feature. Hover over the project you want to use as a template or send to libraries. Click on the three dots at the project's top right corner.
- Select the 'Make a template' option and fill in the details as required. There you'd get a choice of adding the project to a template or creating a new library. You may choose as needed.
Let us know if this helps.