appearing vertically

Hi, @kanadakurniawan

Try unchecking the Show icon labels? option https://prnt.sc/tt10te

Most probably this option is active and there are no labels assigned to the icons.

still not working https://dbigdepo.com/

Hello @kanadakurniawan

Your theme css rule overwrite the plugin css rule, please add the following css rule in Additional CSS from Customizer as a fix.

.widget .zoom-social-icons-list {
    display: block;
}