Paint 3D is a built-in Windows image editor whose "Magic Select" feature is great for one-click background removal.
Open an image in Paint 3D, click Magic Select, and drag a box around the subject. You can fine-tune — add missed parts or remove extras.
Paint 3D came preinstalled on some Windows 10 devices but not on Windows 11. Sadly, it was delisted from the Microsoft Store at the end of last year and can no longer be downloaded there — but the installer can still be found if you need it.