Edit: adding a pic of the files that need to be changed. They are in the FrameworkRes.apk, so you would likely have to edit them and then re-sign the APK.
Fancy transitions are not on, by default, and that is a good thing. They are cool to show off, but get annoying very fast. I hope Fission continues to avoid using them, as this keeps me away from other ROMS.
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