Hi @ajay kumar,
As specified in the documentation: https://learn.microsoft.com/en-us/graph/api/driveitem-list-children, if you already have the drive-id than you can just make the following request to list the children:
GET https://graph.microsoft.com/v1.0/drives/{drive-id}/items/root/children
Or if you want to list the items in a sub-folder:
GET https://graph.microsoft.com/v1.0/drives/{drive-id}/items/{item-id}/children
To list the children based on the Path:
GET https://graph.microsoft.com/v1.0/drives/{drive-id}/root:/{path-relative-to-root}:/children
Such as
GET https://graph.microsoft.com/v1.0/drives/{drive-id}/root:/Shared Documents/Folder1/File1:/children
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