Remove Footer "Layout by…"

Sure you can!

Can you provide your site URL? It makes easier to help you.

Thanks!

Search for such a line in a file named footer.tpl or footer.php.

@geoclaps if he will have problems if he removes the line from the parent theme. After an update the line will come back. Is more safe change the line in a child theme or using a custom css plugin.

I agree, but I was also referring to the child theme.

https://dlnenterprise.com/examplewordpress/

You do not appear to be using a child theme. Do not edit the theme itself. First create a child theme for your changes.