If you want to view the Captivate content at it's true capture size, make sure you view it by launching the published HTML file, not the SWF.
To add to Rod's answer, interpreting a little bit different your sentence 'seems smaller'. You have been capturing on a netbook: which resolution did you have for the capture? It cannot be very high since the resolution of a netbook screen itself is mostly limited. As an example: perhaps you captured at 790x545 (which is already pretty large for a netbook). If you start the published SWF from the HTML it will display in that resolution without any distortion and have all the functionalities needed to play properly. But if you watch this movie on a screen with a resolution of 1920x1080 (most 22/23" screens have this native resolution) the movie will take up only a small part of the screen: about half the height and less than half the width. And it looks 'smaller'. I do not know if this is the cause? You understand that it would help to give some more explanations.