Verify Installation without Re-downloading the ENTIRE game

If I un-install and re-install does it mean re-downloading the entire game?

if the update encounters an error or is cancelled or some other issue it cannot re verify the files and will download the entire game again.

as the xbox replaces files while they are downloading updates it does not have the ability to verify files if you stop or cancel, so if you cancel the update it renders the game useless and you have to re download the entire thing.

On Xbox One, the entire game must be installed to the system from the Blu-ray game disc. Once it is installed, the disc is only accessed to verify ownership.

On Xbox One, both the digital downloads and the discs are exactly the same size. It's actually a rather neat feature of the system. If a friend installs their game from disc on your system, then when they go, you buy the digital version, there's no download
as the game already installed is simply unlocked to run without the disc verification. Very useful if your Internet connection isn't too snappy.

not sure why their is an update size change, probably depends if people are playing on xbox one or series and what res they are using as it may download and update texture packs, also if there is an issue with the update then as xbox does not verify files it just downloads the entire game again.