Monitor Dell P2723 QE in extended mode , I have difficulties with passing the mouse from one screen to the other

I have my Dell monitor P2723QE connected to my laptop via a HDMI cable .

The setting of the Monitor is extend these display  , I have difficulty to pass the cursor of the mouse from one screen to another .

I have installed the Dell display Manager 2.2 

I have to find the setting to make it working the cursor remains prisoner of one screen , I have greet difficulties to pass it to the other screen

Best regards

Alain