I like to work in multiple columns when working on a project.
I will often switch back and forth between the columns and open other files using cmd+p.
If one column has the file open already then it will just refocus on that tab (good!). However, if I am in a column where the file isn't opened, instead of switching focus to that column, it will open a new tab and clutter my workspace(bad!).
Is there a setting I can change so I can achieve the desired behavior I described above? Chrome has an extension that can do this
There's a plugin for Sublime text 3 for this as well, it's called Open in relevant window and it works just like you just described.
Installation is simple and just like any other ST3 plugin, through package control.
Hope this helps!