If you cloned the drive then you are seeing the portion of the drive with the OS data that transferred. Cloning will create a partition the size of the old drives data.  You can increase the drive size in disk management. This page at digital citizen explains how to do it.
Inspiron 15 5510  W11 pro. Added larger ssd to Inspiron 15 5510 went from 256GB to 1TB drive. Upgraded drive now only shows ~220 with ~700 marked as allocated. How do I get OS to use all of the drive? Please advise.    
C: drive capacity