After using your GFMultiSelect, it will overflow if there are too many items. How to set it to slide up and down?

[hardgit]

Describe the bug

flutter for web
After using your GFMultiSelect, it will overflow if there are too many items. How to set it to slide up and down?
To Reproduce

Expected behavior
Scroll up and down.

Desktop (please complete the following information):

• OS: windows10
• Browser chrome, safari
• Version 4.0.0

[hardgit]

If use it in the list, will overflow menu height, if cannot solve that can only give up