This is the "Printer Adjustments" tab from "Project | PDF Options".
Depending on your Printer Driver - you may experience overlapping of text when printing to PDF. Most people never experience this, but if you do, you can make adjustments to your printer using this screen to compensate. For example, if you have some text overlapping, then you can stretch the area that the printer has to draw on, forcing the text to not overlap. You could do this by reducing the left margin and increasing the right margin, with a setting of "-5" for the Left and "5" for the right. You can also achieve good results by applying a setting of "-5" to the Top and "5" to the Bottom. These settings will stretch the drawing canvas, allowing more space and reducing the chances of overlapping text.