Migrating from Skype. I cannot find people/contacts

I am switching from Skype to teams and i just managed, thanks to this "Teams Insider Programs" to get on Teams all (or almost all) the chats i had on Skype.

I just have a big issue now, i cannot see my contact. If i go online and look how to see your contact in teams everyone says something like "view the people app on the left" but i cannot find that. If i go to settings>people, they just give an option to sync (which btw doesnt work).
I just would like to find my contact and see when they are online, for now i only see them if they are into either the "recent" or the "pinned" chats. Is that because i have a mac?