Friendly category URLs - generated only when adding, blocked when editing (PrestaShop)

Question

I have a problem with adding functionality to PrestaShop (1.7.8.9): I want a friendly URL to be created when adding a new category, but not to change when editing an existing one (e.g. changing h1/title) - only manual change is possible.

I've been looking for a solution on many sites, but none of them work.

I'll tell you right away that I cleared the cache.

Please help!

Peace!

I tried editing the file:

Backoffice\themes\default\template\helpers\form\form.tpl
in this place:
onkeyup="if (isArrowKey(event)) return ;updateFriendlyURL();"

I tried editing in the file:

js\admin.js
functions:
copyMeta2friendlyURL(), updateFriendlyURLByName(), updateFriendlyURL(), updateLinkRewrite()

...

I looked in /class, in /controllers, in JS files... and nothing. Maybe someone can tell me where to look for this damn thing?