excerpt length

I’ve tried everything, but I can’t seem to reduce the word count of my blog summary on my frontpage. What am I missing? I followed these instructions in a previous forum discussion see link.

https://kriesi.at/support/topic/how-to-adjust-the-excerpt-length-in-enfold/?login_error

add_filter('avf_postgrid_excerpt_length','avia_change_postgrid_excerpt_length', 10, 1);
function avia_change_postgrid_excerpt_length($length)
{
   $length = 100;
   return $length;
}

• This topic was modified 2 hours, 49 minutes ago by MarcusEls.
• This topic was modified 2 hours, 48 minutes ago by MarcusEls.