Actually, a few changes can be found in Windows 10 on how to manage disk space.
If you are not so familiar with it, Ill explain how this feature works in detail.
Reserved Storage Made Its Debut
The newReserved Storagefeature was firstly introduced in the Windows 10 build 1903.

That is to say, it can ensure the completion of Windows Updates.
You are not able to find it on the devices where people upgrade to the next version.
your machine will work more reliably because of the adding of Reserved Storage feature.

Besides, the temporary files which are no longer needed will be removed automatically by storage sense.
Sometimes, your reserved area may fill up and Windows will continue to operate as expected.
At this time, some disk space outside of the reserved area will be occupied temporarily.
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This part of space cant be removed from the OS once it is activated.
With the appearance of reserve area, the update process will be accelerated.
This post shows you several methods to get them back.
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