The Saxon HE/PE/EE preferences panel is opened from menu .
The Saxon HE/PE/EE XSLT preferences panel
The XSLT options which can be configured for the Saxon 9.3.0.5 transformer (all three editions: Home Edition, Professional Edition, Enterprise Edition) are the following:
Note that any external DTD is likely to be read even if not used for validation, because DTDs can contain definitions of entities.