I'm aiming for a W7 glassy vibe on Win11, and Adjust Taskbar Transparency is greyed out, can't click it at all.
I have transparency effects turned on in personalization, and have "blue the wallpaper", "give the taskbar rounded corners", and "override taskbar colors" off.
I also am using an Aero 11 theme with WindowBlinds and not noticing any changes with messing with the transparency slider in the style settings.
I am using the trials if that has anything to do with it!