Hi, I use a monitor with relatively high resolution and I've just encountered a small problem. While trying to resize panels of the window it was really hard to "snap" mouse cursor to the panel border. I think that they're simply to narrow to precisely point mouse on large resolution screen.
Please find the GIF depicting the problem
Are you using a screen magnification? On a 100% scaling, the handes should have standard width. It may however be that they do not scale (having effectively the half relative size at 200%).