Editing the startup default Symbols
I can remember in very old versions of Illustrator like CS6 and so on, we can edit and modify the start up page, but now, in the earlier versions I cant find that Startup page.
What I am trying to do is modify the default symbols lybrary cause I need to include an specific Symbol that alwways appear in new and every document.

Of course, I know I can save my own symbols library adn then open it and set it up as PERSISTENT, but that's not the point here, I need my especific Symbol always present in the default Symbols Panel.
