The good thing about presentations is you can use a louder than normal voice. Talking from your diaphragm like how a singer does while performing or when a person is angry prevents stuttering. To do this you need to practice your speech or presentation just like how a singer practices a song. Get the pace and breathing in time to your words. Make your voice louder than normal so you’re forced to use your diaphragm while talking. An example of this, President Biden stutters but when he gives a fiery speech, one that’s about something he’s passionate about, not a single stutter. His speeches should be shown to people with a stutter as examples of how you can control it. You can see when he switches from a normal talking voice to what I call performance mode. You can see his chest rise and his voice raise, his words come out sharp and clear.