Hi GamaOS,
For the mentioned use-case, if the modal max-height is restricted as shown in the shared screen clip. I would suggest you try the below-mentioned steps.
Implementation Steps:
1) Define a custom ExtendedClass class called "custom-modal" to the modal widget as shown below

2) Define the custom "custom-modal" class definition, chaining the predefined .modal-wrapper class as shown below in the respective screen style sheet section
.custom-modal.modal-wrapper {
max-height: 130px !important; // restricting the modal height
}
3) Define a custom ExtendedClass called "customDD" to the DropdownSearch widget as shown below

4) Define the custom "customDD" class definition, chaining the predefined .choices__list.choices__list--dropdown as shown below
.customDD .choices__list.choices__list--dropdown {
position: relative;
}
See this sample app | Modal
Hope this helps you!
Kind regards,
Benjith Sam