Prioritize dragging and not panning by default

on touch devices when i try to move objects, it starts panning the canvas. Is there any way where i can prioritize the dragging first and pan on long hold?

First, notice that the DraggingTool takes priority over the PanningTool:
ToolManager | GoJS API
I don’t know if you want to change that ordering.

Second, consider decreasing the DraggingTool.delay, perhaps to zero.
DraggingTool | GoJS API

Third, implement a delay in the PanningTool by overriding its canStart method. Call the super method first and return false if it returned false. Otherwise return false if a touch event that happens before a delay that you specify in milliseconds:

    . . .
    const diagram = this.diagram;
    // don't include the following check when this tool is running modally
    if (diagram.currentTool !== this) {
      if (e.isTouchEvent) {
        // must wait for "delay" milliseconds before this tool can run
        if (e.timestamp - diagram.firstInput.timestamp < ???) return false;
    return true;

Note that I have not had time to test this code.

Thanks Walter!