What do you mean by the new Windows 10 terminal? Are you talking about the Windows Terminal app? If so then please post your question in their GitHub repo. You should also read their posts as I recall that they talked about how to customize the themes if you don't like them.
New terminal/console - reasonable color scheme
Where to find color scheme working in reasonable way in new Windows 10 terminal/console?
Windows 10 Enterprise version 1909 in use yet none of color schemes available under terminal properties, tabs Colors and Terminal works in reasonable way - for every scheme there is a class of string badly visible on scheme's background. It suffice to use for instance grep tool in terminal (via ssh) to run onto problem pointed out.
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Here are the official instructions on customizing Color schemes in Windows Terminal as well as sample color schemes to refer as the basis.
Color schemes in Windows Terminal
Custom Terminal guide
And if there are any questions or problems when making your design, you could first check the "Troubleshooting in Windows Terminal" for some common errors and then seek advice in below forum.
Troubleshooting in Windows Terminal
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