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PyQGIS2 has a function to expand/collapse a layers with a subset of styles in the Layers panel as follows:

self.iface.legendInterface().setLayerExpanded(self.segments_layer, False)

I know that in PyQGIS3 self.iface.legendInterface() has been replaced by gsProject.instance().layerTreeRoot() but making that switch in this case produces an error:

AttributeError: 'QgsLayerTree' object has no attribute 'setLayerExpanded'

What is the appropriate replacement for setLayerExpanded in PyQGIS3?

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You can access it from the QgsLayerTreeNode::setExpanded() function:

root = QgsProject.instance().layerTreeRoot()
layer = QgsProject.instance().mapLayersByName('Layer_Name')[0]
myLayerNode = root.findLayer(layer.id())
myLayerNode.setExpanded(True)
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    Works like a charm. Thanks! – CNIDog May 20 at 20:15
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    @CNIDog - Most welcome, glad it helped :) – Joseph May 21 at 9:22

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