If you no longer need a keyframe, you can easily delete it from an effect property in either the Effect Controls or the Timeline panel. You can remove all keyframes at once or deactivate keyframes for the effect property. In the Effect Controls, when you deactivate keyframes with the Toggle Animation button, existing keyframes are deleted and no new keyframes can be created until you reactivate keyframes.
Select one or more keyframes and choose Edit > Clear. You can also press Delete.
Navigate the current‑time indicator to the keyframe and click the Add/Remove Keyframe button.
(Effect Controls panel only) To delete all keyframes for an effect property, click the Toggle Animation button to the left of the name of the effect or property. When prompted to confirm your decision, click OK.