Here I am editing a couple of files in two columns.
I am using the Cursor Dark theme
I want to adjust the window size by grabbing the vertical separator between the two columns.
I’m on a 4k Monitor. The hit zone is about 3 pixels
Here’s a screen grab
The redline at the bottom might be where it is, who knows. I have to hunt about until I can manage to stop the mouse in the magic darkness.