Hi @Nikolay,
Sorry I missed this.
The Layers panel has been rewritten in scratch.
Rhino WIP Feature: New Layer Visibility Control
Were just in the process of hooking up drag and drop and ironing out some issues.
You can track the progress here:
https://mcneel.myjetbrains.com/youtrack/issue/RH-68678
By the time Rhino 8 ships, this issue would be ironed out.
Thanks,
– Dale