Rearranging and deleting apps has changed in iOS 13. Now, long tapping on an app will display a menu of commands and possibly a widget, if the app developer made one available. One of the menu commands is “Rearrange Apps.” This will toggle the familiar Jiggly Mode, where you can move and delete apps.
But you can also skip the menu popup and start moving apps more quickly. If you start a long tap on an app, notice that your device waits a beat, then displays the menu and any available widgets (on iPhones, you get a haptic nudge too). But if you learn the timing and start moving the app just before that beat is done, you’ll skip the popup menu and toggle Jiggle Mode.