I think you, or the speaker, must have made a mistake, because "that's there" is not an expression that you could use to ends a speech, talk, presentation... In fact it's not an expression at all. People sometimes say "that's that": meaning, "I have nothing more to say on that matter", but I don't think it is suitable for ending a talk. The best way to end a presentation/ speech/ talk, is to come to a natural conclusion, where it is clear that you have completed your presentation. For example you could include the word(s) "finally" or "and lastly" or "to conclude" or "in conclusion", just before your final point. At this point people often say something like, "Now, if you have any questions", or "I'd be happy to answer any questions". Please don't say "that's all"... This sounds a bit dismissive: like you haven't got anything else to say, or you want to say anything else.🙄 If you want to know what people say when they are ending their talks, have a look at a few TED talks: skip to the end and see how they finish off! 🙂

Hi Nancy. These expressions do not have a solid rule to use and usage of them defers from one person to another! I would use "that's it" or "this is it" but the other expressions like "that's all" are also popular to use. 🙂