To scroll down in the Personalize window, please use the wheel of the mouse to scroll down or the touch pad to do so.

In case of a touch screen device, use the touch interface to scroll down.

To scroll down in the code area, for eg. to select app element or the variable names, click on one option and then you can use the down button to go down or scroll using the mouse wheel, for the touch screen device, you can use the touch interface too.