Heyo, this may be a very noob question

I'm asking it to the people which have legally bought FL Studio.

When you open FL Studio, there is a name shown on the title bar (also shown on the Help -> About screen).
I remember that on version 20.8.4 (and previous ones also) there was a workaround allowing us to change this name (https://katfile.com/0s7d3s8qsy9i/FL_Change_Name.rar.html).

But I plan to actually buy it, and the Knowledge Base tells us that :

(source : https://support.image-line.com/action/knowledgebase?ans=524)

However, I found nowhere any hint about when we set this name. Is it related to the First & Family Name that we set on our account ? (if so, it would mean that we can't input a Name without a space like mine)
Or is it related to the mail address of our account ? Or (and I hope it's this), do we set it upon buying it ?
Or maybe I'm all wrong and it's even something else

I hope someone can help me