The Page menu contains various page movement controls.
Display the next or previous page.
Enable or disable page centering.
Redisplay the current page.
These toggles control what is displayed in the page list. The Page Numbers are just absolute position numbers; the Page Labels are arbitrary strings which were assigned by the application which generated the PostScript file. The labels will often match up with the table of contents (if there is one) of the document. For example, the page numbers may be 1, 2, 3, 4, 5, 6 but the labels might be 0, i, 1, 2, 3, 4.
Page labels will appear in parentheses.
Turning off both page labels and page numbers will remove the page list from the screen; if you bring the page list back using the View menu and both labels and numbers are deactivated, the page numbers will be turned on to make sure there is something to show.
This sub-menu offers the following radio buttons for controlling automatic window sizing:
Try and keep the main window large enough to display the entire page.
Try and keep the main window tall enough to display an entire page height.
Try and keep the main window wide enough to display an entire page.
Leave the window size alone.
If your window manager doesn't limit the size of windows (some won't let you resize a window to exceed the screen size), then you can try and use the smartSizing resource to limit the resizing.
Whether or not any of this sizing stuff works is really up to your window manager (which is not required to honor out humble requests) but most window managers will grant our wishes (within limits).