This Maya script creates a window with a huge button to toggle visibility of a selected Display Layer.

20190625_mayaDisplayLayerToggle.py

'''
Display Layer Toggle
Written by Patrick Woo [email protected]
20190625

Descrption:
    This Maya script creates a window with a huge button to toggle visibility of a selected Display Layer.
    An additional text field is present for the user to select the display layer to affect.
    Selection of the existing display layer is done by clicking on the text field and selecting
    from a popup menu, an existing display layer.
'''

from pymel.core import *
def dLayerToggleWin():
    from functools import partial
    winName = 'dlayerToggleWin'
    winWH = [300, 150]
    popupMenuName = None
    dlayer_tfg = None

    def collapseCmd(*args):
        window(winName, e=True, w=1, h=1)
        populatePopup()
        return
    
    def putTextTfg(txt, *args):
        textFieldGrp(dlayer_tfg, e=True, text=txt)
        return

    def populatePopup(*args):
        popupMenu(popupMenuName, e=True, deleteAllItems=True) # clear all menu items
        # returns a list of all display layers that are not the defaultLayer
        dlayers = [x for x in ls(type='displayLayer') if 'defaultLayer' not in x.name()]
        for item in dlayers:
            menuItem(l=item.name(), parent=popupMenuName, 
                c = partial(putTextTfg, item.name()))
        # if there is only one display layer, automatically select it
        if len(dlayers) == 1:
            putTextTfg(dlayers[0])
        return
    
    def buttonToggle(*args):
        populatePopup()
        try:
            dLayerName = PyNode(textFieldGrp(dlayer_tfg, q=True, text=True))
        except:
            print('could not toggle, please check the validity of your display layer name')
            return
        dLayerName.visibility.set(abs(1 - dLayerName.visibility.get()))
        return

    if window(winName, exists=True):
        deleteUI(winName)
    window(winName, title='DisplayLayerToggle (Patrick Woo)', w=winWH[0], h=winWH[1], toolbox=True, titleBar=True)
    columnLayout(w=winWH[0])
    main_fl = frameLayout(l='collapse to reload display layers & save space', collapsable=True)
    frameLayout(main_fl, e=True, collapseCommand=collapseCmd)
    ann = 'Click to select existing layer to toggle visibility'
    tmpCW = [x * winWH[0] for x in [0.25, 0.75]]
    dlayer_tfg = textFieldGrp(w=winWH[0], label='Display Layer', columnWidth2=tmpCW, editable=False,
                placeholderText='enter the name of a display layer', ann=ann)
    popupMenuName = popupMenu(parent=dlayer_tfg, button=1)
    button(l='Toggle Visibility', w=winWH[0], h=winWH[1], c=partial(buttonToggle, dlayer_tfg))
    setParent('..')
    populatePopup(dlayer_tfg)
    showWindow(winName)
dLayerToggleWin()