Unable to edit standard web form

Hello,i am trying to make changes in job applicant web form(standard) in erpnext.
But there is no save option to make a change.

Once i check on login required , there is no save button and when i refresh the page,it goes back to it’s older settings.

You cannot edit a standard web form. It’s better to duplicate/create a new one and un-publish the standard one.

unable to unpublish the standard one…
Is there any other way?

this is an long lasting issue …4 years now…

Any Solution of this?