toolbar button in message viewer
How do I remove the pop up toolbar button that appears at the top of the email message (centre of message under the addresses). This toolbar shortcut has 4 icons delete, reply, reply all, forward. Unfortunately it pops up directly on top of the unsubscribe button of a website I am trying to unsubscribe from! Desperate to stop these emails. Please advise as to how to stop this default button.
iMac, macOS High Sierra (10.13.4)