Trackpad/Mouse's click is not working in iPadOS14

[micturkey]

Hello,
I am using an iPad Pro with iPadOS14 to connect to my PC.
In iPadOS 13, I was able to use my Magic Keyboard's trackpad to simulate mouse operation on PC, but now I can neither use trackpad nor usb mouse to do clicking operation on PC.
Any help will be appreciated and thank you!

[micturkey]

The new version in Testflight has fixed this issue.
But my trackpad cursor moves too fast, is there any way to slow it down?