hi how can I remove the category name in the list of articles, eg "Sample Articles"
I attach the file thanks

I dont know if you can remove the category name.
If you can do it, then in the parameter option of the shortcode.
Open the module and look to the shortcode parameter or add the same shortcode and setup..

in the form there is this:

[showcase source="category: 11" limit="40" show_more="no" show_more_item="3" loading_animation="sequentially" filter_deeplink="no" page_deeplink="no" filter_style="2" filter="no" popup_category="no" popup_date="no" popup_detail_button="no" medium="2" large="5"]

but I don't understand how I can remove the name of the category that I have to use

Sorry there is no option to hide the category in shortcode.
Therefore add this code to your css/custom.css to hide this line

.cbp-l-caption-desc {display:none}

How to add a custom.css
www.joomlaplates.com/support/documentation/custom-css-in-joomla

Thanks !!!

Problem solved.