Yes! When you first deploy the function app to Azure Functions, it will display that notice.
To get rid of that message, follow these two steps:
Step 1: Make local changes to your Azure function code and republish it to the same function app. In the Azure portal, refresh your function application and run it now from the code+Test menu.
Step 2: Go to Azure Portal > Your Function App > Configuration (in the left index pane) > in the Application Setting, change the value of WEBSITE RUN FROM PACKAGE to 0 and click Ok and Save. To execute your application, restart your function app and navigate to the code+test menu.