To manage partition size Windows 10, you can use in built Disk Management Utility. This Utility can expand or shrink partition size in windows.
Manage partition Size Windows 10
- Right click on This PC and Click on Manage. Computer Management Utility will come up.
- Select Disk Management.
- Now Right Click on Partition you want to manage.
- Click on Shrink Volume in case you want to reduce Partition size. Now provide amount of reduction you want in size in MB in space.
- Click on Shrink.
Similarly in case you want to expand your partition size