How to change the engine file in DLE 10?

Question

PHP

Hello! Guys, maybe someone knows - I change the code in the DLE engine on the path \engine\modules\show.short.php, namely, I remove the line

($row['full_story'] < 13) AND $config['hide_full_link'] )

I save but no change. It turns out that now I have news without a title (if this news has less than 13 characters in the Full description column). I remove the restriction, but the title is still missing. As if it doesn’t save, or somehow caches .. if I enter more than 13 characters in the description, the title appears