Access dev environment
go to a modern ui page, add this to the url
?loadSPFX=true&debugManifestsFile=https://localhost:4321/temp/manifests.js&customActions={"a861c815-e425-416d-9520-04bcdf557e27":{"location":"ClientSideExtension.ApplicationCustomizer"}}
sessionStorage.clear()
How to deploy to tenant :
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deploy to style library the following files : a. file in temp deploy b. css
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deploy the megamenu.wsp (that create the list)
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Configure the list, change the termstore name and specify term set ID
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Create the app
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Go to a modern page, In console, type sessionStorage.clear() to refresh the menu