In the animation the shadow is moving from left to right. If I select "Shadow Logo v.2" there are only options like that:
I just want to turn the black shadow into white. Thanks for your help!
Are you still facing this issue? If it were me, I'd merely keyframe the color of the Light shining on the text. Does that not work for you?
Your screenshots are nearly useless. We don't know how you created the shadow or what your settings are. Reveal the modified properties of the layer giving you problems by pressing the U key twice, print screen and paste to the reply field on the forum or Shot + Ctrl/Cmnd + 3 on a Mac and drag from the desktop so we can see what you are dealing with.
You may have to set up a projector and colored lights (complex and a pro technique) or you may be able to use some other technique but without project details it's impossible to give you a workable solution.