Display the Grid:
Tturns the display of the grid on and off.
Place Components on the Grid:
Advisable to keep enabled to avoid any issues with netlisting.
Move components in grid steps.
If jerky component movements are desired, select this check
Draw only Orthogonal wires:
Horizontal and vertical lines only, check here.
Rubberband:
Keeps all the wires connected when components are moved. This may also be switched on and off from the toolbars.
Selection box encloses all of the component
If checked, the mouse selection box must be drawn around the whole component in order to select it. Unchecked if selection of when any part of the selection box enclosing any of the component selection region is required.
Hide Labels on component move:
Hiding the labels of components on moving them can speed things up a little. Also, in amazingly rare instances remove a lack of memory possibility. Best leave this one checked on, i.e. hide the labels on move.
Fastest Drawing Mode:
This leaves a bit of stuff on the screen when moving, but is faster to draw.
Draw Page Border:
Ahmmm, draws a page border.