discourse/app/assets/stylesheets/mobile/directory.scss

.directory {
  .period-chooser .period-chooser-header h2.selected-name {
    font-size: var(--font-up-1);
  }

  &.users-directory {
    .filter-name {
      width: 100%;
    }

    .directory-last-updated {
      margin-bottom: 1em;
    }
  }

  .directory-controls {
    display: block;
  }

  .total-rows {
    color: var(--primary-medium);
    padding: 5px;
  }
}

.edit-user-directory-columns-modal .modal-inner-container {
  width: 90%;
  min-width: unset;
}