Hi @silvio3105 ,
Supply pins in Fusion 360 Electronics have a long history and work in a very particular way(this idiosyncrasy is being addressed as we speak so the explanation that follows is temporary).
Chp 8 of the EAGLE manual covers how they work in detail. Here's the short version.
The name and value of a supply pin are irrelevant, there is no reason to display them. What dictates the net the supply connects to is the name of the supply pin in the symbol. Whatever you name that pin that's the net the symbol will apply to anything it connects to.
Look at the supply symbols that come with Fusion and you'll see this pattern. It also explains why you can't have a generic supply symbol(yet) because the pin name is what drives the supply net's name.
Let me know if you have any questions, I know it's weird.
Best Regards,

Jorge Garcia
Product Support Specialist for Fusion 360 and EAGLE
Kudos are much appreciated if the information I have shared is helpful to you and/or others.
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