Hi, Nora

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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If you wish to have the responsive behaviour on all resolutions including desktop; you can just increase the "tablet width" and 'mobile width' in the plugin Main settings;

you can set a very high number such as 2000 pixel width; in this example I placed full HD ; 1920 pixels;

and if I open the WordPress pages on this resolution, it will have collapsed columns with the little expander + symbol on every row.

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I am sorry but I am not sure i understood, when you say you need the collapsing to start from the second row, if you can describe this in more details, and i will advise if that can be achieved?

I will give you a typical example of a responsive setup we use.

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 if that makes sense?

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/