Which Windows feature automatically adjusts the display and input methods depending on the form factor being used and whether a hardware keyboard is active?

Microsoft Windows Continuum.

Explanation:

Microsoft windows operating system (OS) is a system management software created by Microsoft, that manages system activities and provides a graphic user interface for the best user experience.

This OS can be used in a wide range of devices with various form factors. A form factor is simply the size of the physical components of a device like the screen, the keyboard etc.

Th Microsoft windows continuum is a feature that automatically adjust the display or the device user interface and input methods to match different form factors of devices using the windows operating system.