The below chapter discusses how to swap weapons without the necessity to access the inventory screen.
The game does not state it overtly, but, you can swap your weapons without having to access the inventory screen. For each controller, the key that makes it possible is different, which is why you should view the dedicated chapter to learn about that.
You are free to use several types of weapons interchangeably and swap them depending on the situation. What makes this useful is that some of the weapons deal more damage, whereas some are characterized by higher impact, or energy gain. The ability to swap weapons during a single battle can give you the upper hand, if only you focus on what you want to achieve this way.
All in all, the entire process is very simple, but it is not on display, which makes it easy to miss. In the inventory, you have to pick the weapon that you want to use. By default, that weapon will be set as the favorite one. You can move the pointer over any other weapon and press the dedicated button to favorite it. After you access the inventory, there will still be only one weapon specified as "equipped". By the icon of the weapon that you are not currently using, a start will appear, which means that you will now be able to swap between the current weapon and another favorite weapon.
The game allows you to favorite all types of weapons, but using more than three at a time introduces chaos and may turn out to hinder you.