Where has the Colour Replacement tool gone in Photoshop 2020?

Hi Ruben,

In addition to what Nancy said, you can:

• Click the Search button in the upper right (magnifying glass)
• Select "Photoshop" from the five tabs
• Start to type the name of the tool
• When you see it, click it and the tool will become activated, whether or not it's hidden

It shares space with the Brush tool, so "B" is the shortcut, or use "Shift+B" to cycle through.

~ Jane

Did you customize your Toolbar yet?  Click on the 3 dots icon > Edit Toolbar.  Move Eyedropper or Color Sampler tools from Extra Tools to Toolbar.  Save your Preset.