This problem just started a day or so ago and I’m assuming I accidentally pressed an incorrect key.
All suggestions are welcome and appreciated!
Maybe you have defined too large an area for the print range, Using Print Ranges on a Spreadsheet
If it is just one spreadsheet then click File > Printer settings, click the Options button and tick the box Suppress output of empty pages. OK
If it is all new spreadsheets then click Tools > Options > LibreOffice Calc > Print and tick the box Suppress output of empty pages. OK