Hello
that is a jQuery drop-down
about selecting a different color theme, this has been added in
v3.2.1.13-rc1 +
but there are only 2 theme options (this is in component configuration parameters)
About the search drop-down not being shown add:
(i have added to our website CSS already)
body .ui-autocomplete {
z-index: 2010 !important;
}