Removing form_start from twig views Symfony3.4 - symfony

Question

In order to customize the views of the new user page, I need to remove the elements {{ form_start(form) }} and {{ form_end(form) }} from my twig template new.html.twig. It lets the page unorganized. Unfortunately, when I delete it, the insert new user don't display.
here is my twig code new.html.twig :
<div class="content">
{{ form_start(form) }}
<form class="form-horizontal group-border-dashed" action="#" style="border-radius: 0px;">
<div class="form-group">
<label class="col-sm-3 control-label">
Username
</label>
<div class="col-sm-6">
{{ form_widget(form.username, { 'attr': {'class': 'form-control','placeholder':'Username'}} ) }}
</div>
</div>
<div class="form-group">
<label class="col-sm-3 control-label">
EMAIL
</label>
<div class="col-sm-6">
{{ form_widget(form.email, { 'attr': {'class': 'form-control','placeholder':'EMAIL '}} ) }}
</div>
</div>
<--! and so on -->
{{ form_widget(form) }}
<input type="submit" value="Create" />
{{ form_end(form) }}
<ul>
<li>
Back to the list
</li>
</ul>
</form>
</div>
Is there a way to remove the form_start and form_end from my twig

Answer 1

have you consider using the options of form_start?
like this :
form_start(form, 'attr':{ 'class':'form-horizontal group-border-dashed', 'style': 'border-radius: 0px;'})
you'll be able to remove the <form> but keep a concitent templating
note that the style should'nt be in your html page but in your css file. If you're using bootstrap you have access to this :
<span class="rounded-0"></span>
PS : if you fully template your form, you won't have access to the individual errors of each form that are autogenerated by symfony. read this page for more info.
post edit
I have edited your question to see it more clearly and new questions arised.
why are you using the form_widget(form) if you create all the element by yourself ?
you forgot the form_rest(form)that create the hidden csrf token (essential for security) and finnaly if you want to keep your <ul> inside the form why closing the form with form_end(form) before ?