To access this option, click Main menu: View⁄Options, category: Article⁄Display options.
'Normal' screen mode is the default mode and should function fine in most situations. Depending on some factors, like a video card, the screen resolution, large⁄small font settings, etc. TreePad's 1440 dpi display mode will give better results.
Use double buffer
If you experience some screen flicker, enabling this option will stop it.