Windows 11, 24H2:
According to @ColeTobin, if you're on Windows 11, 24H2, it sounds like you don't need the registry hack below (it may also not even work).
From the "Sort > Group By" menu, switching to "(None)" seems to persist.
If anyone has additional information on this, feel free to share. (My input is limited, as I don't have Windows 11.)
Prior Versions of Windows
The "GroupBy Date"-enforced setting on the Downloads folder has constantly been frustrating to me, but this has been an issue long before Windows 11. Right-clicking and changing Group By works for a little while, but then it reverts back at random times.
(I'm assuming this is the issue you're having)
I did a little research, and found a regedit patch I tried that seems to work (hopefuly it continues to work). I'm using Windows 10, but it may work the same.
Since {885a186e-a440-4ada-812b-db871b942259} is the Downloads FolderType CLSID, the offending registry key values are located here:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\FolderTypes\{885a186e-a440-4ada-812b-db871b942259}\TopViews\{00000000-0000-0000-0000-000000000000}
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\FolderTypes\{885a186e-a440-4ada-812b-db871b942259}\TopViews\{00000000-0000-0000-0000-000000000000}
In these keys you'll see the unwanted settings:
...
GroupBy System.DateModified
...
PrimaryProperty System.DateModified
SortByList prop:System.DateModified
Unfortunately by default, you won't have permission to modify them (even as admin). To modify them, you'll have to take ownership of them first:
Right-click each {00000000-0000-0000-0000-000000000000} key and for each:
Go to Permissions
Click Advanced
You'll see Owner: at the top is System. Click Change
Type your username under Enter the object name to select
Hit Check names to make it detect the full object name
Hit OK to update
(Réponse tronquée)