@Paluri Krishnaji (MINDTREE LIMITED) I think this is because if you have more than one intent the screen is adding a filter with the first intent you added. Even if you select your second intent or create a new intent and add utterance you are not able to view it. If you remove the filter then you should be able to view rest of the utterances. For example, see the screen where my testIntent is filtered and it does not display my other intent called newIntent.
If I remove my filter, it displays my other intent and its utterance.
Please check if this is the case with your intents and utterances and use the correct filter. Thanks!!