Switching between dual display card

No, not as the default.  The nVidia GPU is a co-processor;  only the Intel GPU is physically connected to the display panel.  The Intel GPU will always be primary.

With the nVidia or Windows control panel, you can call the nVidia card into use -- but only as a secondary.

The purpose of the nVidia GPU is to speed up and add the processing features the Intel GPU lacks.

No, it's not possible to set the nVidia GPU to "take over" the display output -- as described above, this is a software-controlled hybrid system;  only the Intel GPU handles the display output.

The term "poor quality" is a descriptor, not quantitative -- it's more likely what you've seeing is the result of a low-end screen (display panel), which isn't unsurprising at the extreme budget end of the notebook spectrum where this system was designed to compete.

If your below statement is correct, what is the purpose of providing 2GB extra graphic feature on low end screen (display panel) laptop's as it is not able to compete with the display output from the graphic card provided. So you were gimmicking customers with the fake specification & attract them to buy this product.

If this is the case, I would have not purchased this laptop with extra Graphic card where it doesn't make any sense at all.

Being in Service Industry from past 15years, I am very glad that Dell is openly agreeing that this product display panel is not compatible with the extra 2GB graphic card provided and customers have to compromise themselves what they have got.

As you know customers are buying the product based on the specification & features what offering/written by vendor in the product advertisement. But true that they are not thinking of its technical aspects in deep like what you said below. 

Anyway thanks for openly agreeing that your product display panel is not a compatible one with the provided graphic configuration.

You're making inferences I did not state, nor imply.

Every system is designed around a specific set of goals.  For this model, the primary one is low cost.  

The GPU you have in the system is designed for office work.  It'll do that just fine.  The display panel is a compromise for the sake of low cost.  

The system is not suited for video work, plain and simple.  If that's what you're looking for, start with the 5000 or 7000 series -- or an XPS.

My question remain same....!!!!!!!

Since I have spent extra money (whether it is 1 Rupee or 1 lakh Rupees) for the graphics card then I should able to see the result in the product. Instead you are giving a sarcastic explanation like "since the laptop  is made in the way where display panel is not compatible with extra graphic card provided, hence extra graphic feature not be available in this laptop"

So do you agree its customer understanding issue or it's Dell product design issue?

As you stated below "Every system is designed with a specific set of goals", keeping that in mind, Dell shouldn't  have designed this particular model with an extra 2GB graphic card since you know that the display panel not support the graphic output. Do you agree on that point? 

I am buying this product first time, so whatever details mentioned in specification field of this product, tend me to buy the product. Because customers are buying the product based on the specification provided by vendor, so they have all the right to set expectation accordingly.

So you cant make the statement like "Dell making the product with specific design & if customer is unhappy, then he/she need to buy a higher version which provides the features as per customer expectation"

I am expecting your reply on my each queries, rather than providing general technical explanation (which may confuse me), because I am a layman customer, who doesn't understand technical stuffs much.

All products come with compromises.  There's nothing here unexpected of an entry-level model system.

You do not get a high resolution screen for an entry level price, simple as that.  There's a reason why more fully-featured, fewer-compromise systems exist, and why they're not priced like entry level models are.

Even the GPU in this system dates back several years -- yes, it has the nVidia name on it, which may connote more than it can deliver -- but it is decidedly entry level.  That's exactly as expected for the price of this system.

The issue here isn't the system specifications -- it's that your expectations are higher than the price level of this system could ever match.

Similar note, the technical specification of Inspiron AIO 7700 indeed looks confusing.
Dell web store shows

Thanks for a clarification that GeForce MX330 is not a dedicated graphics (as it sounds from menu and specs) but a specialized video accelerator for Intel Iris Xe Graphic (built into CPU). The usefulness of such accelerator is most noticeable in rendering speed of 3D games.
Now it is a clear message. Thank you.