If you want to change this arrow carousel style
to this arrow slideshow style
You can use this CSS code to Custom CSS box.
button.user-items-list-carousel__arrow-button--left:before {
content: "\E02C";
font-family: 'squarespace-ui-font';
color: #593c20 !important;
font-weight: 600 !important;
speak: none;
font-weight: normal;
font-size: 1.8rem;
-webkit-font-smoothing: antialiased;
text-align: center;
display: inline-block;
vertical-align: middle;
z-index: 999 !important
}
button.user-items-list-carousel__arrow-button--right:before {
content: "\E02D";
font-family: 'squarespace-ui-font';
color: #593c20 !important;
font-weight: 600 !important;
speak: none;
font-weight: normal;
font-size: 1.8rem;
-webkit-font-smoothing: antialiased;
text-align: center;
display: inline-block;
vertical-align: middle;
z-index: 999 !important
}
.user-items-list-carousel__arrow-icon-background.user-items-list-carousel__arrow-icon-background-area {
display: none !important
}
button.user-items-list-carousel__arrow-button svg {
display: none;
}