I do the same as Carolyn, change the thread color to a darker color so that it shows up, or change the back ground to a dark color so that the light thread color shows up.;)
If you have the ability to change colors just change the color to a darker one and save it that way. I have 4D Extra and that's what I do.
That might depend on what program you are viewing them in? In my Janome software, I can change the colour of background that designs are shown against.
very good question. waiting to see the answer as I am frustrated also.
I also have a program that I can change the colours. I am sure that someone will help you with more information.
I am not much help. I am using a program "Designer Gallery" which allows me to change the color. White for instance is impossible to see. Hope someone comes along and gives you more info.