Why are my borders or gridlines not showing up in print preview in Excel?

1. Check the page setup settings, and make sure Gridlines is selected as a Print option.
2. Check the cell box settings for borders, and if necessary, re-adjust.
3. If border and gridlines are still not showing up, adjust the column width and row height.
4. Toggle the sheet views between Normal and Page Layout.
5. Submit a test page to print preview and readjust if needed.