I ran into the same problem with IntelliJ’s terminal. The default theme can make some text hard to read, especially the pale yellow on white.

What worked for me was going to Settings → Tools → Terminal → Colors and adjusting the text color there. You can also tweak ANSI colors if certain outputs are still hard to see. Just make a copy of your current scheme first so you can revert if needed.

After that, the terminal became much easier to read without changing the rest of the IDE theme.