to open a folder on the desktop using a mouse, you should place the pointer of the mouse over the target object and do what action?

To open a folder on the desktop using a mouse, place the pointer over the folder icon and double‑click the left mouse button.

In many systems, you can also:

• Right‑click once on the folder and choose “Open” from the menu.

• (Less common) Use a single left click if your settings are configured so that a single click opens items instead of just selecting them.

So, for a typical default setup, the expected action is: double left click on the folder.