It seems to have partially inherited fonts and colors from my current settings, which has made it pretty ugly right now. I looked in fonts and colors but there is no settings for C# Interactive.
Go to Format > Font > Font. + D to open the Font dialog box. Select the arrow next to Font color, and then choose a color.
From the Tools menu, choose Options. Choose Environment > Fonts and Colors. Select an option on the Show settings for drop-down menu. To change the font size for text in an editor, choose Text Editor.
Disclaimer: I work for Microsoft on the Roslyn team.
We have not done the polish work to create the logical and correct fonts and colors for the C# Interactive Window yet. In this case, the black text in your screenshot should using Text Editor->Plain Text, but it's not. Instead, it's using "Text Editor->Interactive Console - Black". If you change "Text Editor->Interactive Console - Black" to match your "Text Editor->Plain Text" setting, it should look much better.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With