You can easily modify the CSS of DJ-Classifieds to display the custom fields in more than one column.

I will show how you can do it using our demo installation as an example.

The example product we will be working on is: https://demo.dj-extensions.com/dj-classifieds-new/single-ad-view-with-buy-now

Once the product is displayed in the browser (I am using Chrome, but you can find similar options in other browsers) right-click on of the custom fields and choose “Inspect”.

Now, when in Inspect mod, click on div with class “custom_det_content” to see the path to the CSS in your Joomla installation

In my case, it is: https://demo.dj-extensions.com/dj-classifieds-new/components/com_djclassifieds/themes/clean/css/style.css 

Now, I find the CSS file in the FTP client and open the file

now, in the file we need to add: 

#dj-classifieds .dj-item .custom_det_content { 
 column-count: 2;
}

and save the file.

Now, there are two columns available:

You can, of course, use a different number of columns if needed.

The solution I will show you is the most simple one and need to be done again once the extension is modified.

If you are using Joomla-Monster template built on the EF4 framework you can add those changes to the custom.less file and then it won’t be changed during the DJ-Classifieds update.

Follow this tutorial to add your own styles to Joomla-Monster’s templates: https://www.joomla-monster.com/documentation/template-tutorials/how-to-add-your-own-css-styles-to-joomla-template-based-on-ef4-framework

In my case I have added to the custom.less:

#dj-classifieds .dj-item .custom_det_content { 
 column-count: 2;
}

the effect is the same, two columns added + you are safe with the updates.

You can add more css styles to change the look!

For example
Specify width for class “ Custom_det” for better look on mobile devices!

@media screen and (min-width: 751px) {
#dj-classifieds .dj-item .custom_det {
float: left;
width: 46.9%;
margin-right: 3%;
column-count: 2;
}

This code comes from our reader, who decided to praise him in the comment

And that is the result: