This may not be the most efficient way, but here's what I do-- (I think mine may also be PSE 2018)
Open a new/blank file. Save & name it if you want to
Open the template/layered file.
Select all layers on the layered file in the layers palette.
Right click & select Duplicate layers
There's a drop-down in the pop-up and when you open that up, select your blank file (by name...or, I never name mine, so it's there as "untitled"--not "new"!) as the destination
Then click okay.
When you go back to your other page, everything will be there in layers
