What are the display options for 123 Timer?

After you've added 123 Timer to your Teams meeting, click Share Timer Display. The timer will appear on the bottom of the screen, visible by everyone.

Alternatively, you can ask your participants to each select 123 Timer from the options in the top bar. This will open the Timer in the sidebar for them. Please note this also gives the participant the ability to start/stop the timer and change settings.

If you only want the other members of your team to view the Timer but not be able to change any settings, turn on "View Only Mode."

Then when you ask your meeting members to select 123 Timer from the top bar, they will only see the timer without any access to the settings, as pictured below: