A lot of the time I am using the horizon tool I am working against blue — sky and or water are often these colours and often the definition of the horizon is from one shade of blue to another.
For these cases, the blue line is very difficult to see. I can usually zoom way in until the horizon becomes indistinct and can then see the thin line of the tool, but it would be more useful if it could be set to another colour so it is more easily seen against the photo to judge whether it is slightly off alignment or not.
So you can! I never noticed that. I think because my brain sees the little blue square and thinks it is simply a selection box of some kind, like all the little blue squares in the palettes.
I would also argue that a dull blue, while a fine accent colour for primary interface elements, is not a great default choice for fine lines that overlay on photographs. I’d suggest bright red.
Actually, the lines of the perspective tools would be easier to see if they were variable color, always complimentary to the colors of the background. If M$ can do it for the mouse pointer, surely DxO can do it for these tools.
