You can edit the cross-scene clip only in the all-scene mode.
When in the single-scene mode, you can't edit the existing cross-scene clip. But if you Elongate the main track till the end exceeds the cross-scene clip, you can edit the clip then.
You can edit the cross-scene clip only in the all-scene mode.
When in the single-scene mode, you can't edit the existing cross-scene clip. But if you Elongate the main track till the end exceeds the cross-scene clip, you can edit the clip then.