Panel Drag lines are small
File Panel when docked. I use the file panel coked on the right side of the Dw window. When trying to resize the panel by dragging the left border of the file panel (or is it the right border of the editor panel? whichever) The border is so thin it is difficult to grab the border and drag it. Most of the time even tho the cursor changes to a double headed arrow, it still does not drag. It is almost like the actual drag line is only a pixel or so wide.
It is just as difficult to resize the panels that are docked at the bottom of the editor area.
Could you consider making the active drag area a few pixels bigger. especially for larger screens. (1920 and larger)
Rodger Hollingsworth commented
Forgot to add, this was true in DW 2016 and still true in DW 2017.