How to make a program in WPF work in two modes?

Question

WPF

According to the conditions of the task, it is necessary that the program works in two modes: test mode and configuration mode.
In the setup mode, I will need to enter the number of attempts to pass the program, as well as the font, size and color of the text.
In test mode:
Full name, display test results and save data in a file, as well as read this data and sort it by the best results.
And if I somehow managed to figure out some functions, then I don’t understand how to make it work in two modes. That's not at all.

Answer 1

Make a usercontrol with settings that will only show up in settings mode.
Or make a button that will open the settings window and will be visible only in settings mode.