Choose layout margins and columns.
Indesign margins and gutter.
Enter values for top bottom left and right margins as well as the number of columns and the gutter the space between columns.
Indesign uses the first definition in margins and columns so i m going to guess that is what your question is about.
Gutter widths should relate to the body text leading value.
Open the pages panel window pages and select the thumbnails for the pages you wish to change.
To adjust column guides manually drag them horizontally to new positions producing unequal widths.
Some people use gutter to describe the space between 2 columns other use it to describe the space between two pages.
Planning your indesign pages using margins and columns bookmachine this is an excerpt from nigel french s book indesign type.
You can set the gutter size from the new document menu when creating a new indesign project.
Or you can update or add a gutter to an existing project by selecting layout margins and columns from the top menu bar.
Because adobe indesign layout pages can include column guides as well as margin guides you can establish the gutter dimensions for a variety of layout options within one set of guides.