Hi Keren,
Sorry about all the inconvenience.
I don't think the Excel Agile gantt chart template could be imported to the Project. Because the data structure might not be mapped during the importing procedure.
Another workaround I could think about is, you could extend the gantt chart table like below(The columns after BL are the extended columns):
So all the Months could be displayed on the worksheet, no need to move the scroll bar any more. The limit here is you need to reformat the row 4 Months.
Then, you should be able to print all the months at once.
Regards,
Alex Chen