What if Earth had only one supercontinent?

So I saw one of those "What if Earth had no oceans" videos and had an idea. What if all the continents on Earth were connected together into one large landmass, with the area where the ocean is now becoming more land that is the same height above sea level as the rest of the continents?<br><br>Moderators, please move this if this is not the right place for this.