Help Problem link in the menu when I press

Thanks I had not considered “.htaccess” file and once configured with the multi-site by entering the code below

-----------------------------------------------------------------
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ 

$1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-

(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*

\.php)$ $2 [L]
RewriteRule . index.php [L]  
-----------------------------------------------------------------

it worked! Thank you! Solved now I have to try the plugin`