Hi Eric,
Thank you for your purchase.

Yes there is CSS rule that can solved your request. 

Because the search button floats right on page, we must set to float left, and also move left selector for number of entries.

Just add this code in Custom wpDataTables CSS under the "Custom JS AND CSS" in main settings of wpdatatables.

.wpDataTablesWrapper .dataTables_length {
    float: right !important;
}
.wpDataTablesWrapper .dataTables_filter {
    float: left !important;
    text-align: left !important;
}