If anyone else is looking for this, here is how you can do it...

Class is added in js_slider.js so changing the core file is not advisable... but you can override content in CSS, for example:

.fa.fa-long-arrow-right::before { content: "\f178"; } .fa.fa-long-arrow-left::before { content: "\f177"; }

JoomShaper Team should reconsider this, and add an option so we can choose what icon will be added, or even move the class to the site.php file so we can override it in the template...