Shift+Click commonly used in some programs (like web browsers) to open something in a new tab or window. Currently, you can double-click on a note to open it in a new window, but there is no way to start a new note without leaving the note that you are currently on. Shift+Click on the "New note" button could allow a user to open a note in a new window without leaving the note that they were viewing.
Additionally, Shift+Ctrl+N should also open a new note in a new window.
I would also really appreciate this simple yet very useful feature 
Feature request: Open an internal note link in a new window with Ctrl + Shift + Click
It would be useful to have a keyboard-and-mouse shortcut for opening an internal Joplin note link in a separate window.
Suggested behavior:
When working with two related notes, I often want to keep the current note visible while opening the linked note next to it.
At the moment, clicking an internal note link replaces the note displayed in the current window. Opening the linked note in a separate window requires additional steps, such as locating it in the note list and using the “Open in new window” command.
A dedicated shortcut would make navigation between linked notes faster and more intuitive, especially when comparing, editing or referencing several notes at the same time.
Thank you for considering this feature.