1. First, click the input device indicated by the red arrow in the right-click menu of the input method, as shown in the following figure:

2. Click to enter the list of special symbols indicated by the red arrow, as shown in the figure below:

3. Find the mathematical unit symbol indicated by the red arrow, as shown in the figure below:

4. Finally, find the multiplication symbol in the list indicated by the red arrow, as shown in the following figure:

Note: almost all commonly used input methods have symbol input devices, which can replace this input method, and the operation process is basically the same.