Hide/Show allows the user to remove the navigation-control and navigation panes entirely, usually when screen space is limited. The topic pane expands to fill the space formerly occupied by the left navigation panes. Unfortunately, in Netscape Navigator 4, doing so requires a full reload of OmniHelp, which can be slow; in later versions, and in Internet Explorer, the change is instant. When the navigation pane is displayed, the button name is Hide; when the navigation pane is hidden, the button name changes to Show.