Quickly search documentation, product details and articles.
So, for example, if you want your module to fill whole width of the section: set it to 12, if half, set it to 6. If you want to place two modules next to each other then both sizes will make up a sum of 12. For example: Who Is Online - Grid 7, Birthdays - Grid 5.
Phpbb Documentation /docs/phpbb/start/user_guide.md