where is the Activity Indicator

You force quit by clicking on the Apple logo in the top left of your iMovie project screen. Then select Force Quit iMovie from the drop down menu.

Or, you can simply shut down your Mac and restart.

The progress activity wheel will not display unless there is actual activity going on.

-- Rich

The Activity Monitor is the tiny circular pie chart at the top right of the iMovie interface.

If you click it a window opens with more information.

In my example you can see that it is almost a quarter the way through exporting a short movie and there is about one minute left.

You can stop the operation by clicking the X at the right hand side of the window.

In your case it appears that iMovie was having problems and the AM did not appear so in that case you have to Force Quit as Rich suggested.

Just force quit iMovie.

— Rich

You are welcome.

-- Rich

Yes bro, thx for telling it helps a lot!