iPad Pro 5th Gen display bends in the center when pressed hard

You should have no reason to “press hard” on the screen - and in fact, you risk breakage (and expensive repair) if pressure is excessive. Anything will bend (or break) if enough pressure is applied.

If you have any concerns, you might be well advised to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to assess your iPad screen:

Genius Bar Reservation and Apple Support Options - Apple

Applying excessive force (pressure) that causes any damage may not be covered by warranty.