Is there a bug with the Primary/Sticky Navigation width in version 3.0.2? The settings weren’t showing in Primary Navigation so I used the workaround (below header/publish/float right) to get them to show up but now they don’t work as expected.
Setting the Navigation Width to contained has no effect that I can tell, setting the Inner Navigation Width to contained only effects the Sticky Navigation and when both are set to full the Primary Navigation touches the sides of the screen (1366×768) and the Sticky Navigation has a bit of padding.
The transition seems to have a strange bounce effect that doesn’t happen in 2.4.2
I’ve also had to set the header to 0px header padding (was 40px 40px 40px 40px in 2.4.2) but now that gives the Primary Navigation 40px
If it is missing in 2.4 that is probably because you created a “navigation header” before the Navigation as Header shortcut option was added to GPP – which means you should see options of Navigation Logo etc. in Customizer > Layout > Primary Nav.