Hi,
Unfortunately, workarounds for removed features are not a permanent fix, this feature was removed in 2024, I think, and ultimately the code has changed so even the registry entries no longer work.
There are some 3rd party UI tweakers that claim to be able to do it, but in my experience these programs cause other issues or strange behaviour.
What you can do, if you haven't already, is reduce the number of previews.
open windows settings (Winkey+I)
System -> multi-tasking
From the drop down next to "show tabs from apps when snapping or pressing Alt-Tab" select don't show tabs.
this will reduce it to one preview for each app you have open.
You can, of course still let your opinion known by using the Feedback Hub (winkey+F), feedback sent this way is read by the development team.