Hi,
It feels like the app is resizing the gantt units for the content to fit into the page.
When needing the 'This Month' timeline, you can enable in the module the filter 'this month'.
Would that bring a PDF with the same gantt units as in the report module?
If not, which is your Merlin Project and macOS version?
Which paper size is selected for the PDF? A4? A3? Another custom size?
Best regards, Vicky