How to influence default element for diagram when importing schema

[eelcofolkertsma]

Until recently I worked with single schema file and root-element as first element in file. "add selected top-level element" to diagram works great and I can expand the visualization.

Now IT tells me to work with imported schema for signature. I have the problem that default selected top-level element is now picked from signature schema, rather than from my payload schema. Can I apply naming convention on schema or element, or modify the import statement in payload schema to get back the earlier behavior: default selected top level element is first element in payload schema?

example payload (you need to download the schema first): https://pinggg.mywire.org/Alpha/IATA_Baggage_BagRQ.xsd
signature schema: https://pinggg.mywire.org/Alpha/xmldsig-core-schema.xsd, or https://www.w3.org/TR/xmldsig-core/xmldsig-core-schema.xsd

Element to root the diagram: IATA_Baggage_BagRQ