<% title "#{admin_title} #{t('group', default: "Group")}" %>

<% content_for :settings do %>
  <div class="admin-header">
    <h3 id="setting-header">
      <%= show_responsive_nav %>
      <%= "New #{t('tag_group', default: 'Group')}" %>
    </h3>
  </div>
  <div class="settings-panel row">
    <div class="col-md-12 col-sm-12 col-xs-12">
      <%= simple_form_for @team, url: admin_groups_path, method: 'post', remote: false do |f| %>
        <%= render "form", f: f  %>
      <% end %>
    </div>
  </div>
<% end %>

<% title "#{admin_title} #{t('group', default: "Group")}" %>

<% content_for :settings do %>
  <div class="admin-header">
    <h3 id="setting-header">
      <%= show_responsive_nav %>
      <%= "New #{t('tag_group', default: 'Group')}" %>
    </h3>
  </div>
  <div class="settings-panel row">
    <div class="col-md-12 col-sm-12 col-xs-12">
      <%= simple_form_for @team, url: admin_groups_path, method: 'post', validate: true, remote: false do |f| %>
        <%= render "form", f: f  %>
      <% end %>
    </div>
  </div>
<% end %>

Add ‘validate: true’ for form of group.
Add ‘validate: true’ for form of group.