drupal/core/misc/dropbutton/dropbutton.theme-rtl.css

/**
 * @file
 * General RTL styles for dropbuttons.
 */

.dropbutton-multiple .dropbutton {
  border-left: 1px solid #e8e8e8;
  border-right: 0 none;
}
.dropbutton-multiple .dropbutton li > * {
  margin-left: 0.25em;
  margin-right: 0;
}