Follow these steps:
1. Before logging into Dynamics AX, right-click on the icon you use to launch AX and select Properties.
2. Select the Compatibility tab.
3. Mark the option called: Disable display scaling on high DPI Settings.
4. Launch AX using the Icon from the icon you just changed.
Here are the before and after screenshots:
BEFORE: The property change, the Navigation Pane has huge font and the area page has very small fonts.
AFTER: The Navigation Pane is much smaller and the area page increased in size.