Hi,

You can go through this.

Dropdown Search and Dropdown Tag

Thanks

Hi Pawan_v,
Take a look on these links DropdownTag &
Dropdown Search.
May be it helps you

Hi @Pawan_V 

Dropdown search is by default single select and if you give allow multiple select as true in optional configuration then only you can able to select multiple items.But dropdown tags are by default multiple select only, It's mainly for selecting multiple options in form of tags. But dropdown search is for single select also as like normal dropdown with search functionality.

For more info read below documentation

Dropdown search

Dropdown Search - OutSystems 11 Documentation 

Dropdown tags

Dropdown Tags - OutSystems 11 Documentation

Regards

Murali