Yes, you are right. I tried adjusting the transparency to the lowest setting, but it is still a little dark. It would be better if it could be adjusted to be more transparent, so that only the text is visible.
As for the gallery feature, I am not sure if there are any plans to add it in the future. However, I can suggest this as a feature request to the development team. It would be nice to have a gallery where we can view all the unlocked CGs.