Unable to access Views fields in block Twig template
In block--views-block--page-fields-block-1.html.twig

You can access the view fields like this:

{% for row in content['#view'].result %}

  {{ content['#view'].field['field_name'].value(row) }} 
  // change field_name to the actual field machine name. 

{% endfor %}




Personally, I rather use views-view-fields--[view-name]--[machine-name].html.twig

In your case should be views-view-fields--page-fields--block-1.html.twig

Here you do not need to do a for loop and you can access the fields easily with:

{{ fields.field_name.content }}
// change field_name to the actual field machine name.