How to configure router in nginx config of OpenServer-a?

Question

Nginx

copied Nginx-1.12_vhost.conf to the root of the site folder.
changed
location / {
root "%hostdir%";
index index.php index.html index.htm;
}
to
location / {
root "%hostdir%";
index index.php index.html index.htm;
try_files $uri $uri/ /index.php?$query_string;
}
but that didn't help. you can still browse through the files through the address bar.
contacted Maxim. he responded with one line -
rewrite ^/(.*)$ /index.php last;
but he does not write what to do with it, where and how to insert it.
so I decided to ask here, sobsno, where and how to insert it.?)