how to set a shape divider to full width in a container?

hi everyone,

how can you stretch a shape divider to 100% width in a container?

before i used containers, i could select “stretch section” under layout and the shape divider went across the whole screen.

with containers, this option is no longer available and when i switch from “boxed” to “full width” under layout, nothing happens.

so how can i set the shape divider to full width?

thanks in advance
greetings seto76