The 64-bit version of OneDirve for Windows has been released as a public preview. It is surprising that it did not support 64bit until now.
Windows 64bit was released in the early 2000s. Many apps already support 64-bit, but OneDrive released in 2007 had only a 32-bit version so far. Even though it is a public preview, the transition to 64bit is finally started. Microsoft says the 64-bit version is a good choice when dealing with large or large files.
However, it can be installed only if it has an x64-based processor and is using a 64-bit OS. It cannot be used with ARM64 Surface Pro X etc., and you need to continue to use the 32-bit version.
In addition, since it is currently a public preview, it is necessary to manually download and install it, but after the general release, terminals that meet the requirements will be automatically updated to the 64-bit version.
Source: Microsoft via Thurrott