Show Passage Walls. This option allows you to hide the passage walls. For very large caves, the displaying passage will slow the refresh rate. This can also slow every other operation that updates the display such as changing scale. In fact, the program automatically, turns off this item for caves above a certain size.
Show LURD Bars. This option allows you to the LRUD bars. While the LRUD bars don't slow the display much, they do clutter the screen, so in some instances, it can be useful to turn off this item.
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