Hello everyone! The question concerns the syntax coloring.
If I choose a background color FOR SELECTION other than zero, then I can't select words with the mouse.
And it is no longer possible to select a letter in a word.The picture shows that I tried to highlight the fifth to seventh lines, but the words were not highlighted.
And if I select letters inside a word, I don't see which letters are highlighted.
Is this a bug or is it done on purpose?

Thank you for reply! It doesn't depend on the letters or the file. This depends on the color setting(Tools -> Options -> Color Schemes).
The image shows that I selected the entire text. But the preprocessor commands (#ifdef, #define) are still colored in their own color, and you can't see that they are highlighted.
Also, the comment is not highlighted, the "void" is not highlighted, and the numbers are not highlighted, because the background color for them is different from zero. If you choose background color=0 for them, everything will be fine, but I want a colored background. You never know what I want)), but suddenly it can be fixed in the settings? Maybe I just didn't see an item in the menu?

Yes, I understand, all right. Here is the SEGGER Embedded Studio settings file(settings.xml) with my color settings, and source file(main2.c) as axample.