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To configure the XSLT options, open the Preferences dialog box (Options > Preferences) and go to XML > XSLT-XQuery > XSLT.

The XSLT preferences page allows you to customize options for the default XSLT validation engines. You can also specify the engine directly in a validation scenario.
Note: If no specific engine is specified in the validation scenario and the XSLT file has a transformation scenario associated, Oxygen XML Editor will use the engine specified in the transformation scenario.
The following options are available in this page:
Validation engine - XSLT 1.0
Allows you to select the XSLT engine to be used for validation of XSLT 1.0 documents.
Validation engine - XSLT 2.0
Allows you to select the XSLT engine to be used for validation of XSLT 2.0 documents.
Validation engine - XSLT 3.0
Allows you to select the XSLT engine to be used for validation of XSLT 3.0 documents.
Note: Saxon-HE does not implement any XSLT 3.0 features. Saxon-PE implements a selection of XSLT 3.0 (and XPath 3.1) features, with the exception of schema-awareness and streaming. Saxon-EE implements additional features relating to streaming (processing of a source document without constructing a tree in memory. For further details about XSLT 3.0 conformance, go to http://www.saxonica.com/documentation/index.html#!conformance/xslt30.
XSLT Editor Content Completion Options link
Use this link to switch to the XSLT Content Completion preferences page, where you can configure the XSLT content completion options.