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Oxygen XML Editor lets you control which properties to display for XML Schema components in the XML Schema Design view. To configure the schema design properties displayed, open the Preferences dialog box (Options > Preferences) and go to Editor > Edit modes > Schema Design > Properties.

This preferences page contains the following:
Show additional properties in the diagram
If this option is selected, the properties selected in the property table are shown in the XML Schema Design mode. This option is selected by default.
Properties Table
Show
Use this column in the table to select the properties that you want to be displayed in the XML Schema Design mode.
Only if specified
Use this column to select if you want the property to be displayed only if it is defined in the schema.