Gutters and full bleed.
Indesign margin and gutter.
Open the pages panel window pages and select the thumbnails for the pages you wish to change.
0 5 inch margins become 0 625 inch from there drop your content and get to formatting.
210x297 less 10mm each side would be 190x277.
Use the transform panel to determine the exact with and height of your outer margins.
To achieve uniform spacing set your gutters to the same value as or a multiple of 1 5 or 2 for example the leading of the text.
Assuming i guessed correctly are you trying to define the gutter width or gutter position.
Use margins and column guides to position content.
To adjust column guides manually drag them horizontally to new positions producing unequal widths.
When you re done and you export your pdf you ll have it sized and ready for full bleed printing.
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.
Gutter widths should relate to the body text leading value.
Some people use gutter to describe the space between 2 columns other use it to describe the space between two pages.
Ungroup the object and select all the inner lines.
Use the align functions to align to dartboard.
Indesign uses the first definition in margins and columns so i m going to guess that is what your question is about.
Select format document margins and assign margins that include the additional bleed example.