How to Disable the GoJS array content is moved top to bottom in Canvas Div

I need to requirement to stop movement of JSon array content inside the Canvas Div. Currently JSON array is moving top to bottom . I have to disable arrow cursor to stop top to bottom movement direction. JSon array content will have .image,video file, Gojs shapes. i could not able to set read-only property of JSON array. The video is not playing. I should block moving JSON array Top to bottom area.

Please provide your suggestion.

It’s unclear from your description what the problem is. Could you provide a series of screenshots showing what is happening?