If we are more familiar with the behavioral characteristics of Windows 10, Windows 8.1, Windows 7 and Windows XP, I hope that Microsoft will release a system UI customization tool specially built for Windows 10 and Windows 11 as soon as possible, called Windows UI Tweaker.
Windows 11 might need admin rights to change or recreate the Windows 10 style Start menu (like showing more tiles on the Start menu, theme awareness, enabling rainbow effects, displaying the app list in the Start menu, showing recently added apps, showing most used apps, occasionally showing suggestions in the Start menu, using a full-screen Start screen, showing recently opened items in the Start menu or taskbar jump lists, and in File Explorer's Quick Access, and backing up the Start menu tile layout, among other options), taskbar (including toolbars, showing search icons, showing the search box, showing the Cortana button, showing the Task View button, displaying people on the taskbar, showing news and interests, locking the taskbar, auto-hiding the taskbar, using small taskbar buttons, etc.), search menu (including search highlighting), Snipping Tool, Alt Tab (window switcher), Task View (including timeline), File Explorer, file transfer dialog, system tray (including floating controls for network, sound, clock, battery, language switcher, etc.), notification center, and action center, and more.
Windows 10 or Windows 11 might also need admin rights to change or recreate the Windows 8.1 style Start menu (like using the Start menu instead of the Start screen, storing and displaying recently opened programs in the Start menu, and storing and displaying recently opened items in both the Start menu and taskbar, etc.) and taskbar options (like locking the taskbar, auto-hiding the taskbar, using small taskbar buttons, etc.), Windows 8 style File Explorer and network floating controls, Windows 7 style Start menu and taskbar (including options like locking, auto-hiding, using small buttons, etc.), File Manager, Alt Tab (window switcher), Win Tab (3D switch), and system tray (including controls for network, sound, clock, battery, etc.), and even Windows XP style Start menu, taskbar, and File Explorer, plus Windows NT style Alt Tab (window switcher), and so on.