modify page size of an existing large file

[Liora Darom]

I designed a 270 page document with a lot of text and images.

The publisher asked me to decrease the page widh by a few milimeters. For doing that i would like to make the margins smaller and leaving all the rest un touched.

Whats the best and neat way to do that?

[Robert at ID-Tasker]

https://www.adobe.com/uk/learn/indesign/web/change-page-size?locale=en-GB&learnIn=1

Would it be acceptable to just squeeze pages - make them 9x% wide? 

Otherwise - you are looking at a lot of text reflow... 

Unless you can play with text's horizontal scale or tracking, spacing, etc.