Nvidia Prime Render Offload “On-Demand” doesn’t work with nvidia-driver-450 and ubuntu 20.04.1

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I’ve installed Nvidia 450 on new installation of Kubuntu 20.04.1.
Prime Render Offload works in manual mode with __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia
But nvidia-settings says prime is not supported.
And so I have no prime entry in the nvidia window as you can see below.
So I think the swith between integrated and nvidia GPU will not be automatic and the “on demand” does not work.
What is wrong ? Thank you for your help.
Computer :
Asus A17-TUF766IU-H7074T
OS Details :
Kubuntu 20.04.1 with mainline 5.8.8 kernel
Nvidia Driver version : 450.66
Desktop Environment : Plasma
Window Manager : KDE
Hardware Details
Processor : AMD Ryzen 4800H
GPU : GeForce GTX 1660 Ti 6 Go
[email protected]:~$ __NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia glxinfo | egrep “(OpenGL vendor|OpenGL renderer|OpenGL version)”
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GTX 1660 Ti/PCIe/SSE2
OpenGL version string: 4.6.0 NVIDIA 450.66

[email protected]:~$ glxinfo | egrep “(OpenGL vendor|OpenGL renderer|OpenGL version)”
OpenGL vendor string: X.Org
OpenGL renderer string: AMD RENOIR (DRM 3.38.0, 5.8.8-050808-generic, LLVM 10.0.0)
OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.0.8

And
[email protected]:~$ nvidia-settings

(nvidia-settings:6099): GLib-GObject-CRITICAL **: 14:05:53.205: g_object_unref: assertion ‘G_IS_OBJECT (object)’ failed

ERROR: nvidia-settings could not find the registry key file. This file should have been installed along with this driver at /usr/share/nvidia/nvidia-application-profiles-key-documentation. The
application profiles will continue to work, but values cannot be prepopulated or validated, and will not be listed in the help text. Please see the README for possible values and
descriptions.

** Message: 14:05:53.270: PRIME: No offloading required. Abort
** Message: 14:05:53.271: PRIME: is it supported? no

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