By default everyone invited to a meeting will be a Presenter, sometimes it may be beneficial to make certain people or everyone but you an Attendee instead.  See the table below for how this effects their permissions:

CapabilityPresenter or OrganiszerAttendee
Speak and share video
YesYes
Participate in meeting chat
Yes
Yes
Share content
Yes

Privately view a PowerPoint file shared by someone else
Yes
Yes
Take control of someone else's PowerPoint presentation
Yes

Mute other participants
Yes

Remove participants
Yes

Admit people from the lobby
Yes

Change the roles of other participants
Yes

Start or stop recording
Yes

Change who can present before a Meeting

Step 1 - In Teams go to the Calendar or Team and click on the meeting that has already been scheduled.

Step 2 - Click on Meeting Options in the top bar

Step 3 - Change the option Who can present? to Only me or Specific People (note that Specific People does not work with channel meetings yet)

 Change a persons status during a meeting

Step 1 - Open the participants pane

Step 2 - Hover over the name of the person you wish to edit and click on More Options ... 

Step 3 - From there, select Make a presenter or Make an attendee.