I followed the instructions here, including doing the print out that confirms you have created the extent you wanted to create, and getting the correct result.
https://community.esri.com/t5/arcgis-api-for-python-questions/update-feature-layer-extent/m-p/871090...
This is the part that sets the extent. Very basic:

I did this and got the extent shown below, which is the extent I was hoping for:

However, I see no evidence that this setting is having any effect whatsoever on the view. When I create a view and manually set the extent, that extent is what the view defaults to when opened. When I create a view and set the extent using the procedure above, the view opens to the entire world.
It there a way, with notebooks, to set the view extent so that it has the same effect as manually setting the view extent when you create a view?
Thank you,
Randy McGregor