Hello, I found this nice article about adding a custom project/application settings page using the SDK:
https://community.esri.com/t5/arcgis-pro-sdk-blog/create-custom-project-and-application-settings-using-the-arcgis/ba-p/883358
<!-- Project -->
</modules>
<propertySheets>
<updateSheet refID="esri_core_optionsPropertySheet">
<insertPage id="esri_sdk_PropertyPageProjectSettings"
caption="Sample Project Settings"
className="ProjectSettingsViewModel"
group="Project">
<content className="ProjectSettingsView" />
</insertPage>
</updateSheet>
</propertySheets>
</ArcGIS>
<!-- Application -->
</modules>
<propertySheets>
<updateSheet refID="esri_core_optionsPropertySheet">
<insertPage id="esri_sdk_PropertyPageAppSettings"
caption="Sample App Settings"
className="ApplicationSettingsViewModel"
group="Application">
<content className="ApplicationSettingsView" />
</insertPage>
</updateSheet>
</propertySheets>
</ArcGIS>
Theoretically, it should only be necessary to identify the group-id for the property window of layouts.
Practically, however, there is only one application and one project (at runtime) and several layouts. Which is probably a problem.
So, it is possible?
Thanks in advance!