Has CUDA 10.1 installed which is not supported for tensorflow. How to downgrade CUDA driver alone?

RTX 2080Ti with Driver 430.40 and CUDA 10.1 installed in Ubuntu 18.04. I want to use tensorflow, but CUDA 10.1 is not supported. How to downgrade CUDA driver?

It seems the CUDA driver verison has no strong relation to what the tensorflow-gpu ask for compatibility with CUDA toolkit. As long as the CUDA toolkit version is compatible to tensorflow-gpu, it should be fine.