Try Working with new flynax tamplate on subdirectory

[Viktor]

Hello Get82,

May be you need to add your subdirectory to the .htaccess file.

By default it use:

# The URL prefix to be used for per-directory
RewriteBase /

change it to:

# The URL prefix to be used for per-directory
RewriteBase /new_site/

save and try check again.