See the following bug reported 2+ years ago.
http://forum.katalon.com/t/test-case-editor-displays-garbled-characters-since-v7-9-0/60193
This bug still persists in v8.3.0. I re-posted this because Katalon team has done nothing for it. My previous post was automatically closed 365 days after the last reply. In this couple of days, I wrote fair amount of code in Katalon Studio. This bug irritated me very much.
See the following video where you can see how bad this bug is.


