Welcome to the Community, @Christinehe.

I can share what I know about the features and options you can use in QuickBooks Online.

Currently, you can only customize the fields and appearance of the sales transactions (invoice, estimate, and sales receipt). However, you still have the option to print payment or journal vouchers by viewing them in the system.

1. Click the Gear icon in the upper-right corner.
2. Select Chart of Accounts.
3. Search for the account.
4. Press the Account history option under the Action column.
5. Look for the voucher.
6. Hit Edit. 
7. Click Print at the bottom. 

Since you're new to QuickBooks Online, I recommend trying our free 30-Day Trial to navigate the features. Please visit this link and select the Free 30-Day Trial option under Plus: https://quickbooks.intuit.com/sg/.

Please know that we appreciate your input on this feature. We continue to make improvements in QuickBooks Online, and this preference might be added in the future. 

Also, I've attached some articles you can use to learn more about searching transactions and making changes:

• Search for transactions.

• Enter, edit, or delete expenses in QuickBooks Online.

Please know that the Community has your back if you need assistance. Feel free to post a question, get answers, share tips, ideas, and more. Wishing you and your business continued success.