[FIXED] How do I run two separate instances of Spyder

Issue

I want to be able to have two instances which are completely independent in the sense that I can be working on two separate unrelated projects in different folders without any interference.

Solution

(Spyder maintainer here) This is easy. You need to go to:

Tools > Preferences > Application

in Spyder 5, or

Tools > Preferences > General

in Spyder 4, click the "Advanced Settings" tab, and deactivate the option called

[ ] Use a single instance

Then every time you start Spyder a new window will be opened. If you want the old behavior back, just activate that option again.

Answered By - Carlos Cordoba