You can control or define the size of the form in either of two ways:
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.
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.