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Configure the Simulink® Editor.
These options affect the behavior of all Simulink models. The options relate to the how models appear in terms of the visual theme, the scroll wheel behavior, and the toolbar configuration.
Cause Simulink diagrams to appear in the Simulink Editor using the visual theme that was used in the Simulink Editor before R2012b.
If you check Use classic diagram theme, Simulink does not display content preview. For details, see Preview Content of Hierarchical Items.
Change the default display for signal lines that cross. By default, straight signal lines that cross each other but are not connected display a slight gap before and after the vertical line where it intersects the horizontal line. This display style is Tunnel.
The Line Hop format shows a bend where the vertical line intersects the horizontal line. Simulink adjusts the side the bend appears on to avoid overlapping with a block icon. If having the bend on either side overlaps with a block, Simulink uses a solid line.
The None format uses solid lines. This format can provide a slight performance improvement for updating very large models. If you enable the Simulink Preferences > Editor Defaults > Use classic diagram theme preference, Simulink uses a solid line.
Use the scroll wheel on the mouse to control zooming instead of scrolling. For more information, see Zoom and Pan Block Diagrams.
Specify show or hide the Library/Model Configuration/Model Explorer toolbar.