@bizt

see https://retropie.org.uk/docs/Smaller-RetroArch-Screen/

although also note that you can improve psx fidelity via https://retropie.org.uk/docs/Playstation-1/#video-double-internal-resolution

and you may also want to try the new experimental playstation emulator lr-duckstation, which includes even more (and more reliable) graphical improvements.

and finally we have some shader/smoothing options documented here (though note they can result in performance issues, depending on your hardware, which you did not mention - please see https://retropie.org.uk/forum/topic/3/read-this-first)

Thank you so much, everything is working fine now! The screen is finally back to normal and emulationstation is opening and so is kodi.

Thank you again, yall are great and needed help ;)

@caver01 Totally agree. I was only joking about you "banging" on about it! It is a solid MAME for those "difficult to configure" games. I really appreciate the direction.

@dankcushions Thanks for the tip, I changed the setting to 5:4via the Configuration Editor, that then made the changes to the retroarch.cfg file and that's now the default when I load games. Interesting that by changing it manually it did not work. Anyway, thanks again for all the help over the past few days. I hope this thread is useful for someone else one day who also wants to use a CRT and really wants fullscreen :)