Hi Anita. The FieldWorker and Stakeholder Feature Layer Views are created and managed by Survey123 to allow fine grained secure access to your data. Feature Layer Views are not new as they were implemented in late 2015. You can learn more about them at Getting started with hosted feature layer views Survey123 has been using Feature Layer Views for a very long time.
When you publish a new survey, Survey123 will always create a corresponding Feature Layer. The Feature Layer is used to store the data captured from your survey. If using Survey123 Web Designer to publish your survey, a Feature Layer View will ALSO be created automatically. This Feature Layer View has certain privileges, such as DELETE, disabled. This is to make your data more secure when you share it with users. Additionally, if you share the results of your survey (see Share survey results—Survey123 for ArcGIS | ArcGIS ) the stakeholder view will be created for you.
I strongly recommend that you let the Survey123 website handle your views. You technically can manipulate the views through the arcgis.com website, but you can get in trouble quick... You should not move the views around (away from the Survey123 folder, modify the sharing properties etc).
Using Feature Layer Views is important to keep your data safe. If you were to share your Feature Layer directly, you cannot set different permissions for your people who need to look at your data and for those that need to add data. For example: Sometimes you want to share your survey publicly, so anyone can submit data, but you want to keep your data safe against queries. Views help you because you can use one view (FieldWorker) to enable ADD permissions, and another view (Stakeholder) to enable query access. You will share the FieldWorker and StakHolder Views with different groups of people.
If you are publishing a survey from Survey123 Connect, you will notice that no FieldWorker Hosted Layer View will be created. This is because Survey123 Connect surveys are shared with FieldWorkers using the raw Feature Layer. This is something that we would like to change in the future, because Hosted Layer Views are a good thing.