Looking around rapidly after hearing a "psst" sound or hiding in a closet/under a bed can force Screech to despawn.
If you're struggling with specific entities without using a GUI, the game offers official mechanics to help: New DOORS Gui | Skip lvls, Anti screech, More!
Game developers frequently update room generation logic to break older scripts. If a GUI stops working, you likely need a newer version. Looking around rapidly after hearing a "psst" sound
Automatically advances the player through rooms, bypasses puzzle doors, or deletes gates to reach the end faster. bypasses puzzle doors
If you are looking to use these tools, community members generally suggest: