How can I stop seeing everyone's status on my Outlook Calendar?

Why is the top section of my Outlook calendar jammed full of every person in the organization's  Out of Office and Annual Leave status? And how can I stop this?

I have a feeling it may be to do with synching with Teams. I carelessly clicked 'OK' on a recent pop-up, which seemed to have a profound effect on my calendar. Despite the 'Great work' message, it has caused a massive headache. Any help very very very gratefully received.