You can customize the background and grid appearance of the diagram.
Grid Style: Whether to display grid lines and, if so, the style of the lines (e.g., solid, dash, etc.).
Grid Spacing: The size (width and height) of the grid squares, in inches.
Shadow: The size and color of the shadow "cast" by blocks in the diagram. Note that this applies to all block types, but the shadow will be shown only if the Show Shadow check box is selected on the Defaults > General page for that block type.
Colors: The colors used for the background, grid lines and page separator lines.
Auto Arrange: The horizontal and vertical spacing between blocks, in inches, that will be used if you choose the Auto Arrange ribbon command.
For fault trees in BlockSim, you can also select the Always Auto Arrange check box to turn on Auto Arrange by default.
Block Caption ID: Whether to display the block ID, which is an internal ID number assigned to each block when it is created. You can choose not to display the ID or to display it in decimal or hexadecimal format. If it is displayed, it will appear directly below the block name (i.e., its location, alignment and font will be dictated by the properties that are specified for the block caption).