ActionMode change left icon (back arrow) and change implementation (logic)?

Question

Android

Good afternoon
I am creating a note application
When you long press on the elements in the RecyclerView, you can select the elements to delete
Also in the ActionMode there is a button when pressed, all elements are selected
To do something like this, as I understand it, you need to change the icon and implementation (logic)
How can this be do?

What did I get