How to change the color of all text in photoshop?

Question

Adobe Photoshop

Good afternoon, please tell me how to immediately change the color of all text in this document to black?
link to google docks
I tried it on my own, but for some reason not all the text turns black.

Answer 1

Pavel correctly noted that transparency is not 100% everywhere.
In order not to bother:
1. Just select the layers
2. Change the color to black
3. Transparency is set to 100%, but you should not believe it, so we set 100% ourselves