I have been looking all over Stack Overflow, Google and W3schools and didn't find a sleep or wait function which doesn't bug out my UI.

Task.Wait or Task.Delay both bug out my UI by replacing every object with a white rectangle.

Here's the code:

Task t = Task.Run(async delegate
    {
        OS.label1.Text = Translation.EN_US.SetupLoading;
        centerLabel(OS.label1);
        await Task.Delay(20000);
        return 42;
    });

Note: I am a beginner programmer who's been programming for 3 years