menu.html.twig - Child menu in drop down

Problem/Motivation

In the menu block setting if I set to true expand every menu link I get all the child links displayed. If I set it to false, the children are not loaded into the code
In the twig file the children are not loaded through the css code I can't display them with the hover

Steps to reproduce

Proposed resolution

I tried this cidce by leaving the checkbox setting to false
{% if items %}
{% if menu_level == 0 %}

{% endif %}
{% for item in items %}
{% set is_collapsed = true %}

but the is_collapsed setting doesn't work to be able to load children without displaying them

Remaining tasks

User interface changes

API changes

Data model changes