Hello. Thanks for the reply. I am familiar with these online documents. Unfortunately, they are not relevant to my question. Here are the steps to take;
1. start with /assets.html
2. find and select an image. then the path should be /assetdetails.html/content/dam/......
3. click the edit icon. then the path should be /mnt/overlay/dam/gui/content/assets/assetedit.html/content/dam/........
4. The upper left icon allow users to crop the DAM asset using different aspect ratios, 2:3, 5:3, 16:9, square, Free hand
The question is how to add and remove these crop options?
