I've recently downloaded many versions of Pentaho Report Designer (prd) and I face the same problem : the user interface is way too small on my 1920*1080 screen.
How can I increase the dpi and the icon/font size ?
I work on Windows 10.
I use PRD 8.1, on Windows, in report-designer.bat
I change the following parameter to java launcher
-Dswing.useSystemFontSettings=true
For icons, Java JDK 9 and above should be able to fix it automatically because it will scale with the Windows DPI. Although, DPI can be changed with
-Dsun.java2d.uiScale=2