Thank you for helping, indeed the problem was in the broken installation.
I had removed oxygen editor after I installed it again. Now oxygen editor works well.

Sadly but Reset Global Options and the "Restore defaults" button didn't help me.

Thank you for answer. Let me give more information. I'm Linux user, I use Ubuntu 16.04 TLS (fresh installed stable version) I have installed oXygen 17.1 - it works great including xQuery syntax highlight. Then I installed oXygen 18.1 - it also works great, but without xQuery syntax highlight. Syntax...

Permission for the picture was fixed:
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I got a problem, syntax highlight doesn't work with xquery files. I worked with XML Editor 17.1 and I didn't have any problems with this version. I installed XML Editor 18.1, but there no syntax highlight for xquery. It's cause for working in 17.1 Screenshot: https://drive.google.com/file/d/1RcwJhEW...