Maintenance said:
Does this reg key still work after the latest Edge 118 update in 22h2? Edge has removed the flag edge://flags/#edge-window-tab-manager
so the solution to the problem I had before had stopped working and I am now looking for another solution. If any one can confirm this it would be very helpful.

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Just tested the registry and it did not work for me. The behavior of Edge needs to be modified, the operating system is fine.
Flag:
edge://flags/#edge-window-tab-manager gone again on Version 123.0.2420.53.
Now what? -.-
I found this: Release Release v0.3 . gexgd0419/EdgeWindowTabManagerBlock . GitHub