Push Mosaico view panes down below header blocks

[HeneryH]

Nearly all of the civicrm panels (for lack of a better word, the content panes) are properly pushed below the core theme top bars.

But the Mosaico content panel does not get pushed down the screen under the header panels.

I know there are tweaks that can be made to use a theme that it visually compatible with Mosaico but that can be annoying sometimes.

I just had a site where I tried to install theme-switcher and it whacked my site and i needed to roll back to the nightly build.

Is there a way to push the Mosaico content (ie the Mosaico menu) down so that any Drupal header sections are not covering Mosaico?

[HeneryH]

The problem is that without changing the default admin menu, I cannot find anywhere to turn off the gin-secondary-menu block with a block layout page restrictor.