Hi Harshit,
Can you please show us more details/steps, what you tried so far and what is the end goal?

- Please also confirm what is the table type, is it perhaps a Simple table or another one, like Manual table, etc?

- The Simple tables have a different responsive feature, please check more here.

- On the other hand, if you use another table type, please check this guide on how our Responsiveness feature works.

• We will also provide an example of the Responsiveness configuration :
  
  For mobile screens, a typical layout with our built-in responsive setup can be, for example, like on this screenshot, two columns showing fully, ( you can choose one or more to be "visible") and the rest of the columns, "hidden", 

then there is an " + " button, to open a certain row, and show all the details, of course.

For example, if i got this table

And if i only select columns Client and City, to show on mobile screen, go to Column List:

The little mobile image is used to display on mobile screens, and the one to the left of it is for tablets;

This is the result:

Please check out this Documentation section with a step-by-step example of how to achieve this, and let me know what you think.

https://wpdatatables.com/documentation/table-features/responsiveness/

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So, i will advise to check if you selected the two columns that you need to be both visible on mobile;

see them on column list;  and set them visible on mobile, while keeping the other column grayed out.

Let us know how it goes.