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After upgrade to windows 11 i can no longer move my windows between splits by pressing win+left/right. It uses native windows behaviour defined in "System > Multitasking > Snap windows".
This could be disabled in windows to use DF functions, however it's not possible to bind win+left/right in DF as it says it's used by windows, even tho it's disabled in windows.
The Windows Win+Left/Right hotkeys never supported splits, so maybe you had something for re-binding the keys on Windows 10?
The PowerToys app has a Keyboard Manager section that lets you re-bind keys, so you might be able to set different key combinations in DF, then re-bind Win+Left/Right to the key combos that are set in DF.