Ok, I can read two questions.
I need either a paned format for the ide or an mdi format.
AnchorDocking. => Instead of having lots of windows (editor, messages, main menu bar, ...) => all go into one window
Menu: Packages > Install/Uninstall Packages >> Then find AnchorDocking and install it.
I need to have the constants visible in order to use them
I assume you need to see 2 files at the same time?
Or maybe 2 parts of the same file ?
On top of the editor are the "tabs" (the name of each open file, so you can switch between files).
Right click one of the "tabs" (context menu).
=> "Clone to other Window"
Now you have 2 editor windows, that you can put side-to-side on your screen.
You can drag and drop "tabs" between them.
For the side-by-side you do NOT need Anchordocking.
If you do use Anchordocking, you must either undock one of the windows, or dock them side-by-side.