@basj

Iam sorry, used translator and accidentally doesnt copy full text.

I wanna request implementig this transparency effect in start11. Not only into taskbar and startmenu but also into Explorer and compatible apps.

Start11 already offers blur on the taskbar and startmenu and offers transparency control. On the taskbar you can also disable blur.

Looking at those screenshots it looks like there is no blur at all.

If you want system wide changes you would want to use something like Stardock WindowBlinds.  Changing the rest of the OS is well outside the scope for a start menu app.