Confluence - are column widths in page layouts always fixed?

Hi, I would like to learn more about page layouts. When I see done Confluence pages, I see that they can have preset column widths. Any documentation on this available?

The column widths are preset in Confluence, when you use Page Layouts. You can read all about Page Layouts and Sections on this page of Atlassians documentation.

There is an option of using the Section and Column macros to be able to apply custom widths, which is also explained on that above mentioned page.

We also made a short video about page layouts which you can see in our Video Tutorial Series “Learn Atlassian Confluence”, Video #4.