How to make Toolbar unsticky at the top?
The fixed position is hard-coded into the toolbar.css file included with the core module.

To override it add the following to a CSS file that you're including with the admin theme:

#toolbar {
  position: static !important;
}

body.toolbar, body.toolbar-drawer {
  padding-top: 0 !important;
}


The !important declarations may or not be necessary depending on the order of inclusion...try without it first, and if it doesn't work, try adding it.