Python Tool Form Options

[CW-GIS]

This might be more of a ArcGIS Pro question, but Im making a python tool in Pro and using validation to customize the tool layout. 

How would I go about making the expanding arrow/carrot thing highlighted below?

[CW-GIS · Accepted solution]

Figured it out...Set a Category

[CodyPatterson · Accepted solution]

Hey @CW-GIS 

This appears to be a Category perhaps? That's what I'm seeing so far here:

https://pro.arcgis.com/en/pro-app/3.4/arcpy/geoprocessing_and_python/defining-parameters-in-a-python...

Categories would be at the very bottom! I'm looking for specific examples so when I find them I'll respond!

Cody