The PowerPack Expandable row extension has limited settings for Styling. To change it so it looks like an accordion you have to set it to : Arrow BESIDES Title And add this code.
/*Style Aufklapp-Reihe Downlads*/
.pp-er-wrap {border:1px solid black;}
.fa-angle-down:before {
content: "\f067";
}
.pp-er-open .fa-angle-down:before {
content: "\f068!important";
}
.pp-er-open .pp-er-wrap .pp-er-arrow:before {
content: "\f068";
}
.pp-er .pp-er-inner .pp-er-title-wrap {
text-align: left;
margin-left:20px;
}
.pp-er .pp-er-wrap {
padding-bottom: 38px!important;
}
.pp-er-title {float: left;
height: auto;
margin-top: -3px;
width: 100%;
padding-left: 30px;
}
.pp-er-arrow {
float: left;
width: 36px;
height: auto;
margin-left: -100%;
}