Please help us help you and fill where relevant:
Your LimeSurvey version: 5.6.3
Own server or LimeSurvey hosting: Limesurvey
Survey theme/template: extended theme
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Hi, is it possible to only display a specific question or question group in the print to PDF? 

No,
but you may use the plugin pdfReport
[url] gitlab.com/SondagesPro/ExportAndStats/pdfReport [/url]
to design your own report