Hi m.marinov1733d9wal3, welcome to Thunkable! 
Be sure to check out How to ask Great Questions v2.0, the Community Guidelines, and our Getting Started Guide to make the best of your Thunkable Community experience!
The projects with more than 5 screens will go in to a read only mode and you would need to remove the extra screens before being able to do any editing on your projects.
Please feel free to reach out if you have any further questions!