Welcome to the forum.
You can use the FILTER command to separate them by color, which will create a selection set, which you can then deal with collectively.
After selecting them I would change their layer in PROPERTIES.
If you are unfamiliar with the FILTER command it is very useful.
Should you want to select all the text you could do that with the FILTER command too,
although I would probably do that in my QUICK PROPERTIES palette.