How do I create a platform character that doesn't instantly drop off the screen

Above.

I made a custom sprite this morning in Piksel online, I am following the tutorial to turn its behaviour into a platform character, how do I edit the properties so it doesn’t fall off the screen when I preview?

Just add the platform behavior to the platform and it will not fall of if you want it to not go sideways out then place those platforms with platformer behaviour and place those outside the screen so they work as borders

You should follow G Develop’s Youtube Channel’s tutorials as they might help you they helped me too