If I understand you correctly, all you'd need to do is set the form's size property
]. The size consists of the height and width. You can set them individually if you want to.
If you have a panel that you want to show or hide, you can do that too. You may need to move things around a bit on your form so you'll want to look into the anchor property of the controls and the location property
] of controls that you have on your form to see how to move them around.
Also, the anchor property
] is useful when you want controls to stretch with the form when it is resized.
Hope this helps.