Click the screen flag, it will show the size of the stage. You can change the size on Turbowarp in 'advanced settings' or by using this link (replace 'WIDTH' and 'HEIGTH' by their values): https://turbowarp.org/562188760?size=WIDTHxHEIGTH
All by me. A very simple script. If you use this project, it's better to set the script at the beginning of the program, because it won't change during the execution of the project (so don't put it in a loop or anything that should be executed many times). Note: on turbowarp, the maximum stage size is 4096 for my computer, when its screen resolution is 1920x1080. But I don't know if it could be different on another computer.