I'm wondering how I can expand the transformation line like it's possible for the compositing. Can it be done? Where can I edit the connection between two keyframes from linear to ...?
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You cannot expand the Transform Line in the Timeline. You can finetune your Position keyframes separately in the Viewer.
Create keyframes and navigate between them with the keyframe buttons in the top-left corner of the Viewer.
Click the Transform button in the lower-left corner of the Viewer (Shift-T).
The yellow handles in the middle of your clip are your position keyframes. Control-click on one of them.
Choose Smooth in the popup, you will see two smaller red dots, they are the bezier handles!
You can change direction and speed by moving the bezier handles.