We are developing a google smart home action. As per this and this guides we added testers as viewer and shared action and it worked few months ago. Now we don\'t see this share
As per discussion with 'Actions on Google Support Team' they say that "There has been a slight modification on the interface in the simulator page. Unfortunately, the current documentation hasn't been updated yet to reflect this change."
You can still share your Action without the share button. To recap:
Happy Coding !