What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Based on your screenshot, I see that this is about form 60645160566355.
The color of your Drop Down menus is set inside the theme your form is using, and the theme sets background of the menu to black, while the text of the options is set to blue. Options are visible when your form is opened by regular users:
This is in Chrome:
And this is in Firefox:
The options are only not very readable when the form is opened inside the Form Builder for editing, because the Form Builder applies some of its own styles temporarily when you are editing the form. However, the options are perfectly visible by your end users - text is in bright color, while background is black.
If you need any further assistance, please let us know.