Tap Accessibility to go into the group of settings made for folks with disabilities. Tap on Reduce Motion, then toggle the feature to ON. This will turn off animations when you open and close apps, as well as disable the parallax feature in your wallpaper settings.
Thank you. You've reduced just a little more of the stupid distractions I (we) face throughout my day and, in doing so, increased the quality of life. Sound dramatic? Well, I turned the motion thing off in Windows, I don't stare into traffic while waiting to cross the street, and I don't watch water boiling in a pot. Why would I want to see sliding menus flying back and forth? Thank you again, functionspace.