Customizing exeisting modules

Is it possible to modify models or views of already existing Modules through the web application?
in other words are the modules customizable in terms of modules, views and models via the web application?

Yes you can
You need to edit the XML for the view are you looking to customize

thank you. I’ve tried customizing view by modifying the XMl of view , but no changes could be seen in the view of the form. Also I want to know if I add a custom field to view does the changes apply to the model?

I always change the XML programmatically.
However, if you change the correct view/model you will see the change reflected

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