The XPath preferences panel is opened from menu Editor+Content Completion+XPath
→ → +Disables and enables content completion in XPath expressions entered in the XSL attributes match, select and test and also in the XPath toolbar.
Options are available to allow the user to include XPath functions, XSLT functions or axes in the content completion suggestion list.
The XPath section controls if the functions, axes are presented in the content completion list when editing XPath expressions.
If checked, the editor will indicate in a tooltip helper the signature of the XPath function located at the caret position.