"We have an interactive combobox and a disabled "Add User" button right next to each other. Technically they're different colors (and the difference would be more obvious if they were larger color blocks, or if you zoom in). But when they're both 1px thick, they look really similar, and my worry is that the user is going to assume that they're both disabled. Users with weaker eyes (whether it's because of age or disease) are going to have a harder time differentiating them, too
I don't know what the obvious fix would be. The combobox would be more obvious if it had more contrasting text inside it, but it also makes sense for it to start off with placeholder text that's more de-emphasized. I have to wonder if styling things like the Organization Sync Field control might do the trick" -@Parkreiner

Possible solution
Rethink input logic to add new users

1. have a select option and a save button that is enabled as soon as a new member is selected
2. only have a "add user button" and open a pop-up or drop-down to enter the details
3. something else

Things to consider

• adding multiple people at the same time
• how to add new users (non existing Coder users)