Open Azure portal (portal.azure.com), select appropriate subscription.
Open required VC platform App service, go to Advanced tools in Azure App service, press Go:

KUDU console will be opened

Press Debug console\Cmd

Go to “d:\home\site\wwwroot\modules”, and delete required module folder:

Go to “D:\home\site\wwwroot\platform\App_Data\Modules” and clear the content of this folder (by command “DEL”, for example)

After these actions, restart App service using button in toolbar:

All done, module should be uninstalled after the restart.