If the photo is too big as wallpaper, it can be solved by the following methods:

1. On the page with wallpaper set, select the desktop wallpaper, and then resize the picture until it fits.

2. Try to use the image processing software such as Meitu Xiu Xiu to cut and compress the picture to make it fit the size of the wallpaper.

3. If the above two methods can't solve the problem, you can consider using other decorative methods such as wall stickers or murals to avoid the problem of oversized wallpaper.

I hope these methods can help you solve the problem.