Change the view for an app beyond the standard options

[Thulium]

Hi.

I created my first simple app some days ago. With success.

I use the following standard option for a view (please see my screenshot):

1. View type: Deck
2. Primary header: my_column1
3. Secondary header: my_column2
4. Summary column: my_column3

In the view type "deck" only 3 columns can be displayed.

I have a 4th column I like to display.

The view type "table" is no option for me because my 4 informations I like to present are to wide for small display.

My question:
How can present an additional 4th data in the view type "deck"?

I know HTML and CSS if that are neccessary skills.

Thank you for your help : )