There is no any option of undo.You have to delete apparatus and have to choose again accordingly.
We need to take a new workbench or we can delete the apparatuses taken and start over.
<font size="4">Hello everyone,</font>
<font size="4">I think that all the steps can be undone but if sometimes the solution prepared is not appropriate so instead of creating a new workspace everytime we can delete that solution flask and repeat the process with a new set of apparatus.</font>
We cant undo the steps. But we can remove the items where we got wrong and take new apparatus as well as materials and can continue.
There is no undo option, only we can redo the activities.