Hello, there are two methods to delete the models or lines in the free modeling, and the operation screenshots are as follows:

Method 1: Enter the interface of free modeling, click "Clear" on the upper right corner of the interface, and you can clear the models or lines of free modeling with one click;

Method 2: Enter the free modeling interface - hold down the Ctrl key and do not release it, use the left mouse button to box-select the model/line to be deleted, and then directly press the delete key to delete it.