.select2RtlParent {
    /* can be any value */
   /* width: 300px;*/
    text-align: right;
    direction: rtl;
    position: relative;
}

    .select2RtlParent .select2-container--open + .select2-container--open {
        left: auto;
        right: 0;
        width: 100%;
    }