The custom templates you created using an earlier version of Office are still there, but Office doesn’t show them by default. Instead when you open an Office program, you’ll see the templates provided by Office. If you want to see your custom templates on the Personal tab when you start an Office program, here’s how to do this.
Note: On Office 365 click New and you'll see tabs labeled Office and Personal directly under the New label.
Fix it for me
The easy fix tool fixes all Office programs at the same time. You don’t need to specify the template location in each Office program.
However, the easy fix tool doesn’t help you to set a new location. It only migrates to the Custom Office Templates folder under My Documents. To set a new location, see the "I'll fix it myself" section below.
I’ll fix it myself
In Windows 10, copy and paste the following in the Cortana Ask me anything box, and then press Enter: %appdata%\Microsoft\Templates\ (In earlier versions of Windows, click Start > Run, and paste that in the Open box).
Copy the address that's displayed in the File Explorer address bar.
In your Office program, click File > Options > Save, and then paste the address into the Default personal templates location box.
Make sure you do this for each Office program. After you’ve updated your template location, any new templates will be saved to this default location.