Pagefile on Windows 10 limited to 64 GB?
The pagefile will only ever be 3x the amount of RAM you have, or 4GB, whichever is higher.
3 × RAM or 4 GB, whichever is larger. This is then limited to the volume size ÷ 8. However, it can grow to within 1 GB of free space on the volume if required for crash dump settings.
Source https://docs.microsoft.com/en-us/windows/client-management/determine-appropriate-page-file-size