The only time you should enable Colorize within the framework of dialogue Hue / Saturation is when the image or selected area does not contain any color.
Enabling this framework adds color to the picture. If your image is already colored and you only want to change the color, there’s no need to click on Colorize - simply move the cursor …

You are probably already familiar with the History of Photoshop, which allows you to undo up to 20 steps. Unfortunately, when you quit Photoshop nothing is saved in memory and this no longer works. However, there is a way to undo changes to color and tone after days, weeks or even months.
Here is how: next time you apply a change …