how do i engage fullscreen for PC?

To set the game to true fullscreen (not virtual fullscreen), you need to go into your "user.pso2" file located in the PSO2 folder in "Documents\SEGA" and open it in a text editor, like notepad. From there, look for a chunk of text that looks like this:

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Make sure that you set the Height and Width to your monitor size, set "FullScreen" as true, and "VirtuslaFullScreen" as false. Once you save your changes, the game should start up in fullscreen.