@annewilson
In case you come back, a couple of video demos, Not YT which has become a real pain to use, these are on my cloud storage. I have split into two because of your printing issue.
First the image in Gimp, making a very simple edge fade. More complicated ways might involve pre-made edge masks.
https://filedn.com/lkb9dw6mEfXSsOu9uKLaM...h-fade.mp4 About 4 minutes duration.
1. New 8"x 10" @300 ppi canvas
2. File -> Open as Layers the Image.
3. Scale the image to suit the canvas
4. Make a selection
5. Add rounded corners Select -> Rounded Rectangle
6. Feather the selection, Select -> Feather
7. That is the middle of the selection, you want the outside so Select -> Invert
8. Edit -> Cut
9. ...and if that is ok Select -> None otherwise back off (ctrl-Z) and adjust the amount of feather.
10 Always Save your work for the future.
A bit about printing.
https://filedn.com/lkb9dw6mEfXSsOu9uKLaM...t-ways.mp4 About 2 and a half minutes duration.
I do not have a Win 11 so the Gimp print is Win 10. Should work even without a preview.
...but as an alternative, Export the image to a PDF, open and print with Windows Browser.