www.wysiwygwebbuilder.com

When a class is used "TEXT" Tool normal text color and darkmode text color both do not take any effect when switched. I have tried "Responsive Text" the colors shows perfectly using class styles. Only the "TEXT" tool has this problem.

Another issue on this same tool which I was testing is that when selecting a different font-family none of them take any effect on "Text" Tool. Meaning the font is unchanged no matter what the font is set in the class style.

Maybe you have applied the style the wrong way?
There are two different ways to apply the style, to the text's characters or to the text's container.

Here's a demo how to do it the right way:
https://wysiwygwebbuilder.com/support/w ... tyles.html

Here is a demo I tested it with responsive text the result is perfect it is just the text tool that has this issue I think.

https://temp-file.org/Wv9bmxF3duESCQ5/file

You have applied the style to the text's container. It should be applied to the text (characters) itself.
For responsive text, the the style is the same for the container and characters because it only has one style.
In regular text, each character can have its own style. That is why you will have to apply it the text.

See also the release notes and help
https://www.wysiwygwebbuilder.com/new_features.html

Thanks @pablo for information