Windows + Unexpected Output Window Size

This applies to Windows 8, 8.1, 10 and MXWendler version 5.0 and above

Problem

You want to open an output window but the output window does not appear at the expected location and does not have the expected size.

Solution

In 'Display' in 'System Settings' check the setting 'Change the size of app, text, and other items'. Set the slider to 100%.

Background

If the setting is not exactly 100% Windows reports virtual monitor sizes to applications to equalize high-resolution monitor scaling.