How to add a title to the poster
The poster title is one of the most important elements of your poster presentation. It is the one part of your poster people notice first as they walk by and is what may trigger their interest in your presentation.
Understanding text sizes in PowerPoint:
PowerPoint has a size limit of 56 inches (142.24 cm). In order to create a poster larger than 56 inches, the working document has to be created at half the size of the final poster. For example, a 48x72 poster will be printed from a 24x36 PowerPoint document. Than means that all the text on the original document is also at half the size of final.
If your document is 56 inches of under, the file will be printed at 100% the original which means that your fonts will print the same size as they are on the original document.