I have a grid and the problem when insert the code for stackpanel below it, affecting the the page of other controls. How can make sure this does not happen, it just below it and its not affecting other controls.? I will attach the screen shot so many users can be able to see the reason for this ui affecting other control on my local development.

I want to minimize the space between the grid and rectangle on my application, the problem there is big space them want to adjust the margins of the grid to fit below the rectangle so can have a good ui for my wpf application.