Hello,
We come across in the ArcGIS Pro 3.0. Dimension API for fatal errors. All methods for setting the visibility of graphic elements throw an "Ot of range exception". A Pro enumeration is passed, so you can hardly do anything wrong. This means that the functionality is completely unusable!
- SetDimensionExtensionOption
- SetDimensionLineOption
- SetDimensionMarkerOption

https://pro.arcgis.com/en/pro-app/latest/sdk/api-reference/topic21935.html
At esri colleagues, can you help?
Best regards
Dirk