Width of document changes when merging

[Cagey]

I am merging files to make one document and the with of text border shifts. How can I keep this from happening.

 

[macropod]

That is to be expected if the source documents have different page layouts. Working around it requires introducing Section breaks between the segments. For a macro to automate the process, see: https://www.msofficeforums.com/word-vba/43339-combine-multiple-word-documents.html