You can click and drag the dots, change the gravity blah blah blah BUT, to change the object shape you must go into the code and go to the custom block "settup" and change the code using the "Connect" block and "Spawn Point" block
ALL CODE by @ElectroGameYT Note: There is no shape editor yet, most likely not gonna add one soon, AND when the project starts it will take a moment or two to load the connection data based on shapes complexity (Multiple shapes can be simulated at once :D)