The public deployment of Windows 10 version 1903 is underway towards the end of May. Discreetly, Microsoft has changed its "level of existence" for updating this feature known as Update May 10, 2019.
For available disk space, it was found that compared to Windows 10 version 1809, it requested 32 GB for version 1903 (desktop), both for 32 and 64 bit compression. In the previous version, the prerequisite (minimum) was 16 GB in 32-bit and 20 GB in 64-bit.
Still, the 16, 20 or even 32 GB recommendations do not seem to be really suitable for computer configurations. Legacy of the late Windows Mobile 10? This at least always fits into the IoT (Internet of Things) version of Windows 10.
Recall also that with Windows 10 May 2019 update, storage space of 7 GB will be saved to ensure proper performance. It will be utilized for temporary files created by the applications and system processes, the cache, the success of updates (upgrade).
Working with Storage Sense, this 7 GB location will only be activated with new installations of Windows 10 (clean installation) and new computers are equipped.