To increase your storage space for file syncing, start by opening sync center and clicking on “Manage Offline Files”
Next, click on the “Disk Usage” tab, then click “Change Limits”
Use the slider to adjust your storage to the desired capacity.
If options are grayed out: The increase must be made within the CacheQuotaLimit using decimal. (ADVANCED USERS ONLY)
HKLM\Software\Policies\Microsoft\Windows\NetCache\CacheQuotaLimit
HKLM\Software\Policies\Microsoft\Windows\NetCache\CacheQuotaLimitUnpinned