You can edit the animations that are being showed when navigating through the content part player within an activity.
When you are on the Settings page (the gears), go to Advanced settings and click on Edit settings next to Player.
Animation in: Animation is showed on the page you are navigating to.
Animatie uit: Animation is showed on the page you are leaving.
On start: At the start of the activity.
Forward: When clicking on the 'Next' button.
Back: When clicking on the 'Back' button.
Duration: The length of the animation.
These are the standard settings: