Remove Blank Pages
How do I remove blank pages when I mail merge to letters?
From the Google Docs Add-on Only
NOTE: The information below is applicable to merging to letters only as the issues discussed do not affect merging to emails.
If the content of your Google Docs template is close to the page footer, it's likely that a blank page will appear between each letter in your merged document. This happens because the merged text increases the height of your merged page, and hence some of the content, or its page break, spills onto a new page (see the screenshot below).
You can move your content away from the page footer, or reduce the content or font size in your document template so that you leave enough room for growth at the bottom of the page when the merged text is inserted.
If a blank page appears consistently between each letter, click the Options button from the Mail Merge add-on sidebar and set Add Page Break to No (see screenshot below).