Hi, @jodibob. I'm here to help.

When printing a check stub with 20 bills attached, I recommend selecting a voucher check in your print settings. These checks are usually longer than a standard check but have the same width. By doing this, you can print all the 20 bills on a single check.

1. Go to your check transaction. (In case you need to look for the transaction, you can use the magnifying glass icon)
2. Click on Print Check.
3. Select Print Setup.
4. Choose Voucher.
5. Select Yes, I'm finished with setup.
6. Reprint the check.

Here's a sample voucher check with more than 20 bill payments: 

If this isn't possible at the moment, there is a way to print the list of bills that were paid on one check. I suggest running and printing a Bills and Applied Payments report. Here's how:

1. Go to Reports.
2. Type "Bills and Applied Payments" and select it. 
3. Choose a time period and apply the appropriate customizations.
4. Click on the Print icon.

For further details about printing a check, please refer to this article: Print a check in QuickBooks Online.

I'll also add Step 3 of this article in case you encounter printing alignment issues while printing your check: Fine-tune the check alignment.

As always, you are welcome in the QuickBooks Community should you have further questions about printing checks in QuickBooks Online. Take care.

@AlverMarkT  RE: "When printing a check stub with 20 bills attached, I recommend selecting a voucher check in your print settings. These checks are usually longer than a standard check but have the same width. By doing this, you can print all the 20 bills on a single check."..."Here's a sample voucher check with more than 20 bill payments:"

You didn't even try it, did you?  Nor do you know how voucher checks work, do you?

Your little image of a check with a voucher shows the same 13 checks on two vouchers, the one you send to the vendor and the one you keep. Which is the way QuickBooks has done it for 30 years.

This would be clearer if your pretend output image was real, and had bill reference numbers:

Your pretend image doesn't even add up to the $5000 check total. The column as displayed adds up to $1,210, not $5,000, which is a rather sloppy thing to post. Also, the "With more than 20 transactions" label is, as previously noted, completely wrong. Your image shows 13 checks on each of the two vouchers, just like mine. Only mine was actually created using QB Online, unlike yours:

@jodibob  RE: I can not print all these on a check so is there a way to print the whole list of bills that are paid on one check 

QuickBooks Desktop prints a nice extended voucher that's a whole page or more, but with QuickBooks Online all you can do is print a report, after filtering it down to include just one payment:

Thank You!  The report Bills and Applied Payments worked for me.  I will say I'm not happy that I have to run this separately, but at least it's a professional looking - viable option.