Font Size in MPLAB® X IDE/IPE is not Adjusting to Screen Resolution
This is a known problem regarding the screen resolution for the NetBeans platform which MPLAB® X IDE is built on. Make sure you have the font size set to 100% (anything higher than that could cause a problem).
To change the font size and color of the Editor Window in MPLAB X IDE, go to Tools > Options > Fonts and Colors.