Hi Yash,
Not sure what you meant by the whole test become blue at a time.
You can make annotations interactive by using hyperlink or any content of text annotation. This documentaion link explains on how to make annotation interactive : https://www.mathworks.com/help/simulink/ug/annotations.html#bvfbj85-1
The callbacks can be viewed from File > Model Properties > Model Properties, then go to the Callbacks tab. You should be able to find all the model callbacks.