Meeting notes are now taken directly on the meeting’s Meeting notes tab in the main Teams window. (This is one of the benefits of having the meeting in a separate window.) To access or take notes from within the meeting window, select More options (…) > Show meeting notes and you’ll see the usual side pane come up. In the pane, there is a Take notes button that brings you to the Meeting notes tab.
Focus mode is available when content is being shared. If you’d like to pay close attention to content, without the distraction of seeing video feeds, Focus mode is for you. It’s available in the meeting controls under More options (…) > Focus mode. Give it a whirl!