Dear experts
Sometimes I need to work with a number of different parts of the same notebook, so it is desirable to have 2 or more windows of a document on the screen like below:
This feature is supported in many packages, but I have not found it in Mathematica. Certainly, it is possible to create a pair of copies and work with them, but it is not convenient. Maybe, there exists any workaround of the problem in Mathematica?