1. Select the operation to be deleted in the operation record panel of the software, and then click the Delete button. 2. Use the "Undo" and "Redo" functions of the software to delete the recent operation. 3. Turn off the history function in the option settings of the software. This will prevent actions from being recorded when creating a 3D model, but it also means that you will not be able to use undo and redo functions. Note: Deleting the history does not really delete the created geometry, materials, etc. And just stop recording these operations. If you want to completely delete some elements in the 3D model, you can use the "Delete" function in the software.