Look and Feel Configuration popup is missing

Issue

• The 'Look and Feel Configuration' popup with the custom plugin is blank or missing, even though the same is working fine in update 25 of DXP 7.4.

Environment

• Liferay DXP 7.4 

Resolution

• The observed behavior is caused because of the LPS-147681. Therefore, it is needed to modify xyzPortlet.java class in order to add "javax.portlet.version=3.0"
  

  @Component(
      immediate = true,
      property = {
          "com.liferay.portlet.display-category=category.sample",
          "com.liferay.portlet.header-portlet-css=/css/main.css",
          "com.liferay.portlet.instanceable=true",
          "javax.portlet.display-name=xyzlWeb",
          "javax.portlet.init-param.template-path=/",
          "javax.portlet.init-param.view-template=/view.jsp",
          "javax.portlet.name=" + xyzWebPortletKeys.xyzWEB,
          "javax.portlet.resource-bundle=content.Language",
          "javax.portlet.security-role-ref=power-user,user",
          "javax.portlet.version=3.0"
      },
      service = Portlet.class
  )

Additional Information

• Please reach out to the 'Global Service Team' for getting assistance with the custom development or any customization.