You can control or define the size of the form in either of two ways:
1. Click and drag any of the three handles located on the right and bottom edges and the lower right corner of the form, which always remains pinned to the top left corner of the Design Canvas.
2. To set precise dimensions in pixels, enter the desired values for the Size property in the Properties view.
Note: The Minimize, Maximize, and Close buttons that appear by default in the window control box at the top right corner of the form are run-time features; they are not functional at design time. You can enlarge or maximize the editing window if you need more space for the Design Canvas. You can also hide the Toolbox.