When i make a pdf from libre office calc there are multiple pages, how can I make everything at one page?

it splits my diagram in 6 pages, it has to be 1 invoice

When you export a document as pdf it is similar to printing in that the pagination is dependent on the page size you have set.

If you want the pdf to be a single page you need to set the Paper Format to be big enough to fit the spreadsheet on one page. Format > Page in the page Tab under Paper Format select from the drop down list for Format “User”. This allows you to create a user defined page size. Set the dimensions in Width and Height and the orientation. Click “OK” and this will set the page to your requirements.

Pick Format > Page.
On Page Tab change to landscape/portrait if needed
Then go to the Sheet Tab > Scale (Scaling Mode) > Fit Print range(s) to width/height

Took me over an hour of looking around but finally figured out how to make everything fit on a landscape letter… hope this is helpful. I was pointed in the right direction by previous comment.