in the footer area of the builder page, there is text giving credit to Reaktiv Studios as the plugin creator. This can be removed.

return false to remove the footer text completely

add_filter( 'gppro_admin_footer_text', '__return_false' );

modify the text to display a different message

add_filter( 'gppro_admin_footer_text', 'gpp_custom_footer_text' );

function gpp_custom_footer_text( $text ) {
	return 'My custom text goes here';