Alternative : move to mpdf : https://gitlab.com/SondagesPro/coreAndTools/limeMpdf/blob/master/views/subviews/mpdf/style-bootstrap.twig

My point of view:

1. Maybe it's better to use boostrap class ?
2. if we don't move to mpdf : Must remove usage of col-sm-X : since tcpdf is not compatible with float : https://bugs.limesurvey.org/view.php?id=14353
3. Review all question to see if we have all information needed (see other for list with comment)

From my point of view we should keep the current PDF library but need to adjust the design so things get styled properly. Tis should be fixed at version 3.x.

Then : need to move to table/tr/td since tcpdf dodn't know float :)

@DenisChenu, that's exactly what I did at my project to remove all that additioanl margin/padding caused by the default question containers at the PDF:
<groupsection class="groupSection">
<div class="row">
<div class="col-xs-12">
<h3>{{group.group_name}}</h3>
</div>
</div>
<div class="row">
<div class="container-fluid col-xs-11 col-md-10 col-xs-offset-1 col-md-offset-2">
{% for questionId,question in group.answerArray %}
{% set questionTemplate = './subviews/printanswers/questiontypes/template' ~ question.questionclass ~ '.twig' %}
{% if (aSurveyInfo.printPdf == 1) %}
<table width="100%" class="pdftable" style="padding: 5px; page-break-inside:avoid;">
<tr>
<td>{{ include(questionTemplate) }}</td>
</tr>
</table>
{% else %}

            {{ include(questionTemplate) }}
            {% endif %}
            {% endfor %} 
        </div>
    </div>
</groupsection> 

{% endfor %}

Yes Mazi : this part is easy to fix BUT all question.questionclass.twig contanis col-sm dic then big place inside each cell.

For this wrapper : i think we can work without table/td. The issue is more in question :)