Let me guess:
Since this is on old japanese game it doesn't know what texture scaling is and will change my resolution to 640x480 without consent, using 1% of my OLED's available screen area and messing up all open application windows.
This is actually the re-re-re-re-re-re-master of the original game.
That means this has better/improved/not-20-years-ago graphics, and it kind of scales correctly full screen to modern monitors.
Of course, the graphics are nowhere close to 4K, and "scales correctly" means the 4:3 images get blown up to the size of your screen, but keep the 4:3 aspect ratio. Nothing to do about the extra 60% you'll waste of your screen.
Not that I'd know why you'd care about that... The point of this game is to spend 50~100hs reading text with the occasional image thrown in for flavor