How can I create a document without gutters?
Gutter
Enter the amount of space to leave between the left edge of the page and the left margin. If you are using the Mirrored page layout, enter the amount of space to leave between the inner page margin and the inner edge of the page.
Another definition of “gutter” is the space between two columns of text. So how should we understand your question?
Please edit your question to give more details (don’t use a comment, modify it directly). Generic information: OS name, LO version. Specific information: description of the kind of documents you create.
Right click on the page and select Page Style… from the context menu. In the dialog that appears, go to the Page tab. In the Margins area, make sure Gutter is set to 0.00". Click OK.