Social Share Button sharing every single slide of the Full Width Slier

Hi,
can I put a function that allows to “cut” the news title?
I only find the function tu cut the excerpt
add_filter(‘avf_postgrid_excerpt_length’,’avf_increase_postgrid_excerpt_length’, 10, 1);

function avf_increase_postgrid_excerpt_length($prepare_excerpt) {
$prepare_excerpt = 80;
return $prepare_excerpt;
}
but not the title one
Thank you!
federica