To create a new custom panel layout
Once you close the tear-off panel, it can be used by panel layouts that include it.
To assign a custom layout to one of the icons in the Quick Layout bar below the Tool Box
on the
thumbnail you want to assign the new layout to, and select the layout
from the menu.
on the thumbnail
again and select Change Image. You can select
a pre-made image or load an icon image from a file.