Default Select
Use <select> attribute with numerous options to show value with choice's option.
Menu Size
Use multiple attribute to select multiple values and size="your value" attribute to show a number of choice option within a select area.
Select Size
Use form-select-sm class to set small select size and form-select-lg class to form-select class to set large select size. No such class is required for default select size.
Choices
Single select input Example
Set data-choices attribute to set a default single select.
Set data-choices data-choices-groups attribute to set option group
Set data-choices data-choices-search-false data-choices-removeItem
Set data-choices data-choices-sorting-false attribute.
Multiple select input
Set data-choices multiple attribute.
Set data-choices data-choices-removeItem multiple attribute.
Set data-choices data-choices-multiple-groups="true" multiple attribute.
Text inputs
Set data-choices data-choices-limit="Required Limit" data-choices-removeItem attribute.
Set data-choices data-choices-text-unique-true attribute.
Set data-choices data-choices-text-disabled-true attribute.