A container is where the main content and information appears. In general, omit the header and footer part of the website and what remains is the container.
The content area and the sidebar are parts of the container. The content area is technically called as the primary container, whereas the sidebar is the secondary container.
You can apply container layouts globally for the entire website through the Customizer option at Appearance —> Customizer —> Layout —> Container.
Different containers can be applied for individual pages and posts from meta settings as well.
Astra offers various container layouts options. Learn about each of them on the links below:
Please note, more options may appear here when users have one of the plugins which have special integration for Astra. Ex: WooCommerce, LifterLMS, etc. So you will be able to choose a different container for the layouts of those plugins.
1. Container layout can be overridden by the page meta settings. The priority of the meta settings is higher than the customizer settings. Read more about Meta Settings here.
2. The width of the container depends on the Site Layout settings.