Excel opens automatically when I boot and login

[Cromulent]

I have a rather annoying problem where Excel (Office 365) will open whenever I turn on my computer and log into my user account.

Does anyone know of a way to stop this happening? It is just one extra thing I need to close when I start using my computer. I'm running Windows 10 Pro 1803 at the moment.

 

[Cromulent]

Strange it isn't in any of those places, but it seems to have stopped loading at startup now. Not sure I understand why but at least it is no longer doing it.

Thanks for the help though .