Captions doesn't appear on my video

My colleague created a video on her storyline file and add captions.
From my file, I imported her file with the video and captions.
I can noticed that the captions do not appear on the video.

However, I can see in the Edit Captions tab that the subtitles are present.
Is there a button to activate the subtitles? 
Thanks a lot for your help ! 

Margo