tia® Viewer Core is configured using configuration parameters. There are different ways to specify them, described here: https://kgs-software.atlassian.net/wiki/x/FAALxw .
There are two categories of configuration parameters:
Global settings apply to the tia® Viewer Core instance, and
Instance settings apply to named instances, so configurations can be mapped to repositories, respectively to business objects and document types (SAP Customizing only, see Customize by repository respective business object and document type).