I need to remove the check for all the layers on a map that has the "UT Simbology" check. I am not really sure If I could use update layer because this is an extension developed by a GIS company for utilities and I am not really sure how to do that because it is not an Esri command.
Which Python command could I use for that?
I need to save all the layers simbology then, but if I have the UT simbology checked, it does not work on ArcGIS Pro.

arcpycommands if this is a custom extension. You might be able to usecomtypes, but that's only a guess. I'm not sure if you can access custom extensions with them. You can read more here: https://gis.stackexchange.com/questions/80/accessing-arcobjects-from-python – KHibma Jan 18 '22 at 15:37