In Adobe After Effects (AE), the method of deleting keyframes depends on the properties you want to delete keyframes. Here are some common scenarios and how to delete keyframes accordingly:
1.To delete a single keyframe: Select the keyframe you want to delete on the timeline, then press the delete key on your keyboard or right-click to select the "Delete" option.
2.Delete All Keyframes: If you want to delete all keyframes, select the layer and press the U key on your keyboard, which will show you all the keyframes on the layer. Then select all the keyframes and press the delete key.
3.Delete all keyframes for a single property: If you want to delete all keyframes for a property, select the property and press the U key on the Timeline, then select all the keyframes and press Delete.
4.Delete keyframes in range: If you want to delete keyframes in a specific time range, select the range and press the delete key.
5.Use the Keyframe Editor: Select Keyframe Editor under the window menu and it will display all keyframes. In the Keyframe Editor, you can select and delete keyframes for different properties.
Note that it's a good idea to make sure you don't need keyframes anymore before deleting them, because once you delete them, you can't recover them. When keyframing, it's recommended that you save your project regularly in case something unexpected happens.