x3270/Display scaling

From The x3270 Wiki

x3270 automatically scales the sizes of graphical elements according to the screen resolution.

The screen resolution is learned from the resource Xft.dpi. 96 DPI is the base value. DPI values less than that will result in smaller elements; larger values will result in larger elements.

Note that the fonts used for menus and pop-up windows are not automatically scaled. To ensure these are scaled, use the x3270a utility.