Here is a YouTube computer tutorial about Siduction Linux and the EFI vs GPT Install Conundrum, and is part of a growing collection of videos I have found which should be useful to you for using Calamares and Dosfstools and the EFI vs GPT decision during setup. There are thousands of YouTube computer tutorials out there, but this is a good one when you need using Calamares and Dosfstools and the EFI vs GPT decision during setup.
This tutorial, "Siduction Linux and the EFI vs GPT Install Conundrum" is a free tutorial you can watch, which will help you understand how to get better performance, usability, and an overall better experience using your laptop or desktop computer.