## 1.Track operation bar
The track operation bar contains the following operations: undo, redo, copy, paste, split, delete, set as asset group, fold/expand track,scale track.
* Undo：Undo the last edit option
* Redo：Redo the last undone edit
* Copy and paste：Copy and paste assets in the track area
* Split：Divide the selected clip into two clips；The splitting point follows your current time cursor；Click the button to split
* Delete：Delete assets in the track
* Set as asset group：Select the asset in the track and click the button to set as asset group; Clicking the right mouse button can also set as asset group.
* Fold/expand track：Fold/expand track audio asset within the track.
Expand
Fold
* Scale track：Click on the"- ""+ "sign to scale the track ratio, or you can directly slide to adjust it.
## 2.Track timeline
* Display the time point of the track
* Time progress bar can be zoomed in and out.
## 3.Asset track
* Different types of Assets are on different tracks
* There are the following types of tracks: Video, Image, Audio, Filter
* The maximum number of tracks of each type is 10
* Multiple assets of the same type can be accommodated in a single track
### 1)Extend & shorten the material duration
* The duration of the asset in the track can be extended & shortened
* Move the mouse to the edge of the asset, click and drag the edge to extend & shorten the asset
### 2)Move asset position
* The asset position in the movable track includes movement on the vertical track and movement on the horizontal time axis
* Click the asset with the mouse and drag to move the position of the asset
* If the asset is dragged out of the track area of this type, a new track will be generated
### 3)Multiple Selection
* Assets can be selected by dragging a selection box or clicking with Ctrl/Shift to select multiple assets at the same time.
* Selected asstes can be dragged within the track, changing the timeline position as a group.
### 4)Separate audio
* Applies only to video assets
* Right-click to separate the audio, the audio of the video itself will be separated and become an independent audio asset
before
after
* You can right click again to restore the audio
### 5)Replace assets
* By right-clicking, you can replace assets by uploading resources from your local device or asset library to replace existing ones.
### 6）Mute
* Applies to video and audio tracks only
* Click the mute button to mute all material on that track
* Can be tapped again to unmute
### 7)Time Sequence Swap
* Resource groups on the main track support setting Time Sequence Swap.
* During export, clips participated in swaps will be randomly recombined to increase the number of video variations.
（For more information about Track Settings, please refer to[ Create Asset Group](/video-tools-video-editor/video-editor-user-guide/standout-features/batch-production-function-swap/function-step-by-step-intro/add-asset-group-to-the-track.md) Create Asset Groupfor reference.）
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