I used the WinUI 3 Template in VS2022, and I created two pages according to the navigation setup, placing them in the left navigation bar for selection

For example, have Page A and Page B, the default page is Page A. Suppose I enter the number 55 in the numeric box in Page A, and when I switch to Page B
When switching back to page A, 55 has already reverted to the default value

How should I modify this problem?

I hope I can keep the content of each page when I switch back and forth