https://letmegooglethat.com/?q=what+does+a+flared+magwell+do
The above link will explain what a flared magwell does.
Basically it's a funnel to help you to quickly insert your magazine however it is not needed.
If you have the standard full size grip module you can't get a flared magwell. You would need to upgrade to a x-five grip module to get a flared magwell... if you want one.
I would strongly recommend that you let Google answer a lot of these questions for you and that you take some time to "go down the rabbit hole" about your new firearm.
Googling or youtubing the following search phrases may (or may not) help to explain more about your firearm and help you in your learning journey:
P320
P320 grip module
P320 trigger
P320 fire control unit
P320 magwell
P320 slide
P320 xfive
P320 legion
P320 vs p320 xfive
P320 xfive vs p320 legion
P320 Caliber x-change kit
P320 full vs carry
P320 axg pro
P320 rxp
P320 txg
P320 romeo1