This feature allows you to manage all of the Captions in your Space. You can control what captions you would like to be displayed and what size font in which they appear.
Select the Captions icon from the Panel Menu on the right hand side of your space. The options for viewing Captions will appear.
Use the checkboxes to show and hide specific Captions.
In Captions you can also control what size font in which the caption will be displayed on your space. In the upper right hand corner of the side panel, a text box with the current font size is shown. Use the buttons located to the right of this box in order to make the text larger or smaller.