Reddit user u/digidude23 discovered that PS Plus added a feature to allow players to sort through PAL and NTSC versions of PS1 games. PS Plus subscribers may select the "Change Region" option within the settings menu for classic PS1 games on PS4 and PS5. If the player changes the game's region from PAL to NTSC, the game will reset and start up as the newly-selected NTSC version. The player may change the PS1 game's region back to PAL, if desired. The Change Region option is located below the "Controls" option, so it's hard to miss once the game is paused.