Thanks for joining this thread, PQH. I appreciate your attached PDF.

If addresses aren't lining up correctly, you can set up forms for window envelopes.

Here's how:
 

1. Use the Gear icon, then go to Custom form styles.
2. Choose a form and click its Edit option.
3. Access the Design tab, then hit Edit Print Settings.
4. Tick your Fit printed form with pay stub in window envelope checkbox.
5. Select Done.

To ensure the return address is visible through your window, limit it to six lines. QuickBooks formats the return address like this:
 

• Line 1: Your Company Name
• Line 2: Address line
• Line 3: Address line
• Line 4: Address line
• Line 5: Address line
• Line 6: Address line

You can shorten or change your return address if necessary:
 

1. When a customer pays their invoice, you can record the payment by opening it, clicking Receive Payment, then entering their payment information.
2. Hit Company.
3. In your Address section, use the Pencil icon.
4. Make your necessary changes and select Done.

If you're not using Intuit's Forms Envelopes, and are instead using a third party's envelopes, this could be why addresses aren't lining up the way you need them to. You can order Forms Envelopes from Intuit if necessary.

In regard to editing PDF files, I can certainly understand how such an ability could be useful and have submitted a suggestion about it as of today. You can also submit your own feature requests while signed in.

In the event you have Adobe Acrobat, you may be able to edit PDFs with it. There's also other third party PDF editors which may come in handy for editing your documents.

I've also included a detailed resources about printing to window envelopes which may come in handy moving forward: Print forms for window envelopes

Please feel welcome to send a reply if there's any additional questions. Have a wonderful Tuesday!