It is annoying that the drag arrows are VERY sensitive on window borders for resizing.
Also, the corner drag thingy to make or close another window is a pia sometimes.
Lately, I been using the View->Duplicate Area into New Window for editors and Outliner window and using Blender
in a Gimp style. Resizing duplicate windows is more comfortable, it does create other minor window management and usage problems, but it is better now, at least for my needs.
Examples, I use Outliner quite often on some projects, and can now have it out of the way till needed and sized more usuable than a small corner default size. I can use reference internet images behind 3D editor better than a full size Blender screen now.
Try that, it might work for you also.