Under the View-menu, you'll find three types of view settings:
With the layout setting (Metal/CDE/Windows) you can change the overall look and feel of the editor. Personally I prefer the Metal-style, but I'm not sure if anyone cares... :-p
The change font panel allows you to adjust the font size and -style applying for the entire editor. (Note that some stuff, like the HTML help pages or window sizes are really hard to adjust. Therefore these obey mainly two font sizes: less or equal 12 pt and greater than 12 pt.) Which fonts look good varies greatly from system to system. The default font usually isn't the worst choice.
The map view settings are a nifty feature that allows you to select
which types of objects you want to see & modify. For instance, if you select
"Show Monsters" and "Show Walls", the map view will display only that:
monsters and walls. Even copy/paste actions will ignore all objects which do
not match the active view settings.
This feature can be used to detect disguised exits, connected objects and
more. You can also use it, for example, to copy objects without their
background tiles.
Unfortunately, the map view settings require pretty extensive calculations when applied for the first time. So, if you have several large maps opened, expect to wait a short moment after applying a new view setting.