I am using django MPTT model in my template and just want to remove indentation. Now it’s look like this:

how to remove indentation from html template?
here is my html:
{% load mptt_tags %}
{% recursetree contact %}
{{node.message}}
{% if not node.is_leaf_node %}
<div class="children pl-2 pl-md-5">
{{ children }}
{% endif %}
{% endrecursetree %}
I am not familiar with the django-mptt library, so I can’t specifically address your question. However, in general, you can always override a library’s template with your own. With your own template, you can make the tree appear however you like. (Or, in this case, replacing their templatetag with your own.)
One thing I just noticed is that you’ve got a lot of “hanging div” tags. You’ve got a <div ...> before {{ children }} but no </div> after. My first shot would be to remove that div tag to see what happens.