Short answer

When this question was posted, in 2017, it was not possible to view the page breaks on the normal view. If you are still looking for this feature, please submit a feature request by using Google Feedback.

Workarounds

You might use the print preview feature and the set custom page breaks as a workaround.

1. Click on the Help menu
2. On the search box type print.
   This will open the Print view.
3. If you need to adjust the page breaks, on the right panel, click SET CUSTOM PAGE BREAKS.

How to submit a feature request to Google

To submit a feature request by using Google Feedback from a Google spreadsheet, do the following:

1. Open a spreadsheet on Google Sheets
2. Click on Help > Help Sheets Improve
3. Fill up the feedback form and submit it.

Related

• How to force a page break in Google Spreadsheets

References

Notes: As of October 2023 the below links are broken but they might still be helpful to find the referred content.

• https://productforums.google.com/d/msg/docs/QmU767bXKHI/5HqLlVrqCQAJ (posted on 12/14/16 UTC -6)
• https://productforums.google.com/d/msg/docs/HAj2Jzna8aU/9ZbwUHqfEgAJ (posted on 11/13/15 UTC -6 and marked as best answer)