Unfortunately, looks like Tile/Cascade was removed from Windows 11. The WindowsHotKeys calls to the Win32 API succeed and sometimes tile or cascade a couple windows on the screen, but not all and the Win32 API seems quite broken. Adding an issue here in case an alternative workaround can be found. I had my hopes up that this library would fix the Windows 11 woes of removal of tile/cascade options on the taskbar, but alas there is a bigger underlying problem than just a UI change to the taskbar.
; Tile and Cascade windows
ReadAndStoreHotKeyAction(ShortcutsFile, "TileWindowsVertically", "TileWindowsVertically", "!#V")
ReadAndStoreHotKeyAction(ShortcutsFile, "TileWindowsVertically2", "TileWindowsVertically", "!+#V")
ReadAndStoreHotKeyAction(ShortcutsFile, "TileWindowsHorizontally", "TileWindowsHorizontally", "!#H")
ReadAndStoreHotKeyAction(ShortcutsFile, "TileWindowsHorizontally2", "TileWindowsHorizontally", "!+#H")
ReadAndStoreHotKeyAction(ShortcutsFile, "CascadeWindows", "CascadeWindows", "!#C")
ReadAndStoreHotKeyAction(ShortcutsFile, "CascadeWindows2", "CascadeWindows", "!+#C")