It’s only visible by clicking on the “Preview the PHP code” of the “WordPress” tab > “Page Settings”, not in the tree panel.
I don’t want this to be included in my theme, so to remove it I should delete the line in the exported header.php or Pinegrow editor allows it to be removed in another way?
However, my intention is to completely remove that part of WordPress functionality, without even advertising the capability to accept pingbacks/trackbacks.
I can remove the line from the header manually in the exported header file, np, just thought I might also control it before exporting the theme.
And indeed, you will need to continue removing this line manually (or automate the process using a script after each export) because there is currently no way to change this behavior through settings in Pinegrow.
Note: Of course, with no guarantees, we are adding this feedback to our list of topics to possibly consider for future updates.