Leaving irrelevant contents out of your demo or presentation will let you have the following perks:
Extra time for more important matters
Time is always precious for everyone. By taking only that important information, you will be able to save more of your time as well as your client’s or prospect’s. This can also open more spaces to talk more about business, thus, increasing connection and engagement for a higher chance of a conversion.
You will look more professional if you will just stick with what is only needed by your prospect. Remember that they are not in a meeting with you to talk about off-topic matters so you should keep the flow in the right line always.