The Workspace pane of the Options dialog box lets you control the appearance of the Microsoft Expression Design interface.
Theme You can select a color scheme for the user interface from the Theme list. When you select a theme, the interface updates immediately.
Workspace zoom The panes and panels in Expression Design are resolution-independent and can be scaled to any size. To increase the size of your workspace elements, drag the Workspace zoom slider up or to the right; to decrease, drag to the left or down. Alternatively, you can click the value to type a specific zoom amount.