Expected behavior
The existence of a menu item that would allow deleting a profile on all devices where this profile exists.
Actual behavior
The menu item does not exist.
Rationale
Delta Chat is great when you want to talk to someone you are unsure about. You can create a profile just for this discussion. If it goes badly, you can just delete the profile, and that person is out of your life forever.
I had this happen yesterday. A discussion went sideways. I decided to end it. However, I was using my phone and in bed. I deleted the profile on my phone, but I did not want to get up and walk to my laptop to delete it there too. I had to block the person prior to deleting my profile, and luckily they did not try to reconnect with my profile, but if they had wanted to, they could have.
It would have been nice to have an option to nuke the profile from all devices at once.