Thanks for the screenshot.
What you are seeing there is the normal Microsoft Photos viewer, not the editor. The "Edit" button at the upper-left only opens the editing tools when you select it.
If you mean you no longer want JPEG files to open in Microsoft Photos at all, right-click a JPEG file > "Open with" > "Choose another app," select the app you prefer, then choose "Always."
If that is not what you mean, what happens differently now compared with how JPEG files opened before?
Thanks!