How to rotate my layer?
If you want your layer to show up rotated in your slider, all you need to do is to add an incoming animation for you layer.
Make sure, that you have the Expert mode turned on.
Click on the More button at the Layer window:
Then turn on the Special zero option in the bottom. This will make your first layer animation to be the "ending point" of how your layer will look like.
Now you can choose the display. Make sure, that the default 0% opacity is changed to 100%, and you could use the Rotate - Z option, or any other.
Apply it, and you will see this in the Preview of your slider, or in your Slide editor, if you press the Play button in your Timeline.