Styles Window
The Styles window enables you to view or change the visual appearance of diagrams or elements that are currently selected (in focus). The style attributes fall into two general groups:
•Formatting settings (for example, font size, weight, color, etc)
•Display settings (for example, show background color, grid, visibility settings, etc).
Styles window
Changing a property from the Styles window is immediately reflected in the user interface. Likewise, making a style change in another place (for example, setting the visibility of the diagram grid using the Show Grid 
toolbar button) affects the applicable property in the Styles window.
The Styles window has a dropdown list in the upper part, which enables you to select the level at which the style change is to be applied (for example, at individual element level, or at project level). For more information, see:
•Changing the Style of Elements