Use the Options menu > Preference command to display the Preferences form. Use the form to control the spacing, grid sizes, tolerances, line thicknesses, pan margins and zoom step sizes.
Background Guideline Spacing: Controls the spacing of the background guidelines in length units.
Fine Grids between Guidelines: Controls the number of equally spaced invisible grid lines between guidelines. As an example, specifying 3 means that there is a fine grid line at the one-quarter point, half-point and three-quarter point between guidelines.
Nudge Value: Controls the distance that a nudged shape moves. This item is entered in length units.
Screen Selection Tolerance: Specifies the minimum distances between the mouse pointer the shape being selected for the selection to be effective. This item is entered in pixels. The screen selection tolerance has no effect on selection by windowing. The Section Designer default for this item is 3 pixels.
Screen Snap To Tolerance: Specifies the minimum distance between the mouse pointer and the snap location for the snap operation to be effective. This item is entered in pixels. The Section Designer default for this item is 12 pixels.
Screen Line Thickness: Controls the thickness of all lines on the screen. The thickness is entered in pixels. The Section Designer default for this item is 1 pixel.
Printer Line Thickness: Controls the thickness of lines and fonts in printed output. The thickness is entered in pixels. The Section Designer default for this item is 4 pixels.
Pan margin: Controls the distance beyond the edge of a view that can be panned.
Auto zoom step: Controls the size of the step used for the View menu > Zoom In One Step command and the View menu > Zoom Out One Step command. This parameter is entered as a percentage. The magnification of all objects in a view is increased or decreased by this percentage.
Max Mesh Size (Absolute): Controls the maximum size of the mesh used to display section properties.
Max Mesh Size/Overall Dim.: Controls the size of the mesh as a relative dimension.
Mesh Merge Tolerance: This tolerance is shown in Section Designer for review purposes only. It cannot be changed in Section Designer. The value can be changes within SAP2000 using the Options menu.