Indeed, the functionality is not supported at this point. Basically, the animations are part of the native implementations of the RadSlideView
in the different platforms and it would not be possible to replace them with custom ones. I have logged the behavior you are looking for as a feature request at our end. You can track it on the following link from our Ideas & Feedback
portal - SlideView: Add support for custom transition animations.
Please subscribe to the item so that you are automatically notified when there is progress on the matter. I have also added some points to your account for the suggestion.
Have a great rest of the week.
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