Yes,it is the wrong place and that's probably because you have no current subscriptions. Support in this forum does require a current subscription I'm afraid.
This is done deliberately because there is a lot less space on mobile to show the description field - but if you want to change it Use this code...
#slideshow .g-owlcarousel .g-owlcarousel-content .g-owlcarousel-item-desc {
display: block;
}
To create a custom CSS compatible with Gantry 5 please read this
http://docs.gantry.org/gantry5/tutorials/adding-a-custom-style-sheet
.
Remember to recompile CSS from base outline too.
Regards, Mark.