open the second folder with 00 name then open up scaling then when the box pops up change the value fron 4 to 3 click ok click hexdecimal 3 times like the guy did in the video then click refresh and come out and sh3 should now run in full screen
let me know how you get on if your still having problems we can do teamviewer with that free software for private none commercial use i can logon to your laptop and sort the full screen issue for you teamviewer d/l link below for me to logon on to your laptop i would need your teamviewer id and your password and i would tell what i was doing before i do it.
your almost there i have seen your screen shot of the second 00 folder
https://www.teamviewer.com/en/
do you have discord installed on your laptop and a headset so we can chat Sir