Hi @juriy84! Welcome to the community 
Thanks for reaching out and providing your feedback 
Currently, there is no feature that allows to hide the below message from UI.
We track our issues publicly on GitHub and would love for you to file this request there so other customers can also weigh in. Our product managers use that feedback to prioritize and add items to our development roadmap.
Please however note that all the data in Scratch pad is saved locally on your machine and not synced to your account.
To help preventing any accidental data loss, we encourage to utilize workspace and get it synced up with your account 
Thanks again for your feedback! Let me know if you have any other questions 