How do the two displays on the two graphics cards display normally?

I use two 2080ti graphics cards, each connected to a monitor.

In the Ubuntu environment, only one monitor can display normally, and the other will only display a fork when the mouse moves over.

How can I make both monitors display normally?

My environment is like this:

  1. GPU----two 2080TI GPUs
  2. NVIDIA GPU Driver Version----460.91
  3. System Operator----ubuntu18.04