Hello Jay Bao,
Thanks for reaching out to Microsoft Community.
We're sorry for the inconvenience this has caused you. We understand how important the comfortability is when typing on your keyboard.
Apparently, as much as we would like to help, but this is indeed by design for its protection and to help the keyboard from wearing out. Nevertheless, Surface Pro Signature Keyboard is still a premium keyboard with next-level versatility.
But in your case, you might want to contact Microsoft Store online for more recommendations that suit your preference: Contact Microsoft Store Support - Microsoft Support
Hope this helps.
Regards,
StevenK