after starting DxO PL4 the “Essential Tools” palette is displyed on the reight side of the screen. But as soon as I switch to any of the other palettes like “Color” “Essential Tools” disappears. Afterwards I did not find a way to display the “Essential Tools” again. What am I doing wrong?
Palettes collapse or expand when you click on their title bar. Clicking on the X removes the palette.
Palettes can be managed through the View menu, where you can also reset the workspace completely.
Read more about it here: General interface
After you finish using whatever you needed in the color menu, click on the color menu button again and your essential tools menu will return.
Thanks a lot, thats what I was looking for!