Profile Box - No vertical scroll bar

I created a larger box with multiple values that can be selected by the user. When a user edits it they see the values they can select/selected.

There is no easy way to navigate the values other than using the arrow keys.

It was also set up so you could select multiple values but now it seems to have disappeared.

How do I get multiple value selection and a scroll bar?

Have I done something wrong selection or setting?

Thanks a lot.