Hi Heinz,
My number is still the same, my phone is bad... it is discharged too fast, miss calls, periodically doesn't show notifications, etc.
But it is too "new" to be abandoned, so I still try to use it.
I have just installed Sonar (in demo mode, I have no plans to subscribe) and I can't reproduce. AZ Controller window appears with exactly the same size as in CbB for me.
Does Sonar Preferences window has good size for you? It is also "old style" normal Windows dialog, as AZ Controller.
Probably something to do with HiDPI, but I don't have any HiDPI monitor to check...
Alexey.