I just wanna say this cause I had problems with changing my save location, looked everywhere so if you have this problem getting error code 0x80070005 when trying to do it watch this video it helped me
:https://www.youtube.com/watch?v=CBbDuhJrZ8Q&ab_channel=AarohanTechSol
If you are too lazy to do that just follow these steps.
1. Go to this pc.
2. Then click the drive you are trying to change your save location to.
3. Find a file named WindowsApps.
4. Right-click and look for change name and change it to WindowsApps.old .
5. And try to change again your default save location again.
1. If it still does not work look for a file named WpSystem.
2. Right-click on WpSystem and Press change the name and change it to WpSystem.old
3. And try again, Now it should work.
I hope this helped I'm not that good with this so if u have more problems I can't really help I just found this and I wanted to share it.