Hello,
Welcome to Workstation Community.
After you expanded virtual hard disk size in VM settings, you'll need to "do something" in Windows Disk Management of your guest OS to use the added space.
To open Windows Disk Management
1. Open "Start" menu,click "Run" (or Press [Win+r])
2. Type: diskmgmt.msc
3. Press [Enter]
4. You should be able to see about 160GB of unused spaces there
"do something" means
a) Expanding existing partition in your guest OS. This will depend on your current partition settings, in some cases, existing partition cannot be easily expanded by diskmgmt.msc. Then you may need a third-party partition tool which is more powerful than diskmgmt.msc.
b) Create a new partition with the unused space and mount the new partition with a new driver letter, like E:\.
Hope it helps.
Regards,
Shawn