It depends on your animation. If you are talking position then you can possibly copy the position keyframes, delete them, then paste to the Anchor Point. This will only work if the layer is the same size as the comp.
If things are more complicated than that we would have to have a detailed description of your project to be of much help since there are about a zillion ways to animate a lower 1/3.
It sounds very straightforward and REALLY simple to fix: two position keyframes.
- Put the timeline cursor on the BEGINNING keyframe and make a timeline marker, Shift-0-9 on the keyboard. Not the numeric keypad.
- Put the timeline cursor on the ENDING keyframe and click on the position keyframe stopwatch to clear all position keyframes. Click on it again to make a new one.
- Go to the timeline marker you made by hitting 0-9 on the keyboard.
- Grab the layer and shift-drag it to the right until it's off the screen.
If it takes you more than 20 seconds to do this, you need to start running Basic AE tutorials or there's something you didn't tell us initially/
Another way to flip the position keyframes on the x-axis is to add this expression.
Like Rick said, there are lots of variables and many ways to alter them.
If you could show a screenshot of your keyframes, we could give more help.
It looks like most if not all of your animations have only 2 keyframes. I would double click on the first keyframe in each animation involving position and adjust the x value. You can double click the first position keyframe, if the value is a negative number then remove the minus sign and add + the comp width and you have reversed the animation.
I think that would be the fastest way to redo the animation.
The other option wold be to reveal all keyframes using the U key, then use the j and k key to move to the next keyframe in the animation and simply shift + drag the components of the animation to the other side of the frame one at a time. This will keep all your easing and timing in place.
Thanks for the answer! This doesn't work with the shape-path animation right?
Heck, I'd just precompose the background to make it a single layer. Then you can move it horizontally in the main comp at will.
If you do a lot of titles picking up a titler plug in, I use NewBlue, and there are others, can be a huge timesaver. They have lots of bells and whistles that greatly reduce time spent on repetitive tasks.
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1. Precomp the entire lower third
Open scale properties for the comp - click unlink
set the x property to -100
go into the comp and do the same thing on the text layer, so your text won't be backwards.
Make the layer 3d
rotate the y axis 180 degrees
go into comp, and do the same thing to the text layer so the text won't be backwards.
right click on precomp, (or go to layer menu) > transform > flip horizontally
Then use one of the above methods to flip your text back where it was.