I appreciate you reaching out here in the Community, qbuicreceipts-gm.
In QuickBooks Online (QBO), printing an estimate template in Excel format is currently unavailable. You can download it as a PDF file instead to get the outcome you want.
Here's how:
Open your QBO account.
From the Gear icon, select Custom forms styles.
Look for the template from the list and click the drop-down arrow under the Action column, then select Preview PDF.
Choose the arrow down or download icon to save the template as a pdf file.