Hide Child Links in Header with Sandbox Theme

Took some time searching around for a solution to this problem. Many cited solutions out there but none of them contained code in my specific setup. After some tooling around, I decided to try the following:

in themes/sandbox/functions.php

the very first line of code should be:

function sandbox_globalnav() {
	if ( $menu = str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages('title_li=&sort_column=menu_order&echo=0') ) )

by adding &depth=1 directly after the echo=0 like:

function sandbox_globalnav() {
	if ( $menu = str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages('title_li=&sort_column=menu_order&echo=0&depth=1') ) )

I was able to suppress the child pages in the header, without limiting access to the child pages from the parent- to view the site change you can go to https://garrisongunter.com and see that when you click on the projects page, there is a list of projects with links. The previous workaround was not useful, you had to have a login to view the projects pages. Glad to have this working.