After changes are made, at the top of the properties settings
window next to the Nested
Map Navigation name display and down arrow
button, click the icon Up One Level to Parent Map to return to the
top level map. It is an icon with three circles and an up
arrow.
To display a larger view of the material swatch, click the
Preview Map Channel Procedural Results button. It is the last
button in the Diffuse Map area with a cube and magnifying
glass.
Click the drop down arrow in the Nested Map Navigation panel.
The Texture Map is displayed.
Select the Map Synchronize toggle button to disable/enable the
settings and value changes of the map channel to be pushed and
synchronized to all map channels. By the default this toggle is set
to enable. It is enabled when the icon is combined. It is disabled
if is separated.