How do I show only accounts with balances on my Balance Sheet?

Thanks for turning to the Community for your concerns, @heguilustoyp@gma. I've got you the steps to remove the zero balances showing up on the reports.  

Here’s how:

1. Go to Reports.
2. Select Balance Sheet report.
3. Select Customize, then click the Rows/Columns link.
4. In the drop-down arrow of Show non-zero or active only, choose Non-zero for rows and columns.
5. Click Run report.

For future reference, you can visit this article to learn more about using filters to customize reports in QuickBooks Online. 

Feel free to message again if you have additional concerns about reports. Take care always.