There's a Link Size parameter that you have to uncheck. When you define the global object, you can define whether the Link Size parameter is true or false by default - by default, the default is True, and so each instance of the global object you create has Link Size set to True, and you have to manually set it to False if you want to re-size it. If you know that you're going to want all the instances of the global object to be different sizes, change the Link Size default setting of the global object to False, and all instances will initially be created at the same size as the definition, but can then be resized.