Notepad++ has a feature to allow two simultaneous views of the same file in the same instance.
This is useful if you want to view two different regions of a file side-by-side.
Does Eclipse have this feature?
Use 'Window > Editor > Toggle Split Editor (Horizontal)' or 'Toggle Split Editor (Vertical)'.
The keys Ctrl+_ and Ctrl+{ are shortcuts for these actions. On macOS the keys are ⇧+⌘+- and ⇧+⌘+[