Set default multiple options for record under user filters in the Record

I think what you're looking for is Multiple Dropdown Component. If that's the case then you can set default options based on the ones you have. Check the following example:

load(
    local!language: {"en_US","es_ES"}, /* Here you set the default values you want to show */
    a!multipleDropdownField(
         label: "Language",
         instructions: "In which language are you most proficient?",
         choiceLabels: {
             "English",
             "Spanish",
             "French",
             "German"
         },
         choiceValues: {
             "en_US",
             "es_ES",
             "fr_FR",
             "de_DE"
         },
         value: local!language,
         saveInto: local!language
     )
)


You can look for more information here: docs.appian.com/.../Multiple_Dropdown_Component.html

It sounds like you are referring to pre-selecting Record User Filters (a!facet()) with multiple default options when the User loads onto the Record List.

In short, it's not possible.

There is not a straightforward way to do this because the "defaultOption" field of a!facet() does not accept a List of Text as an input, even when "allowMultipleSelections" is set to true.

A common solution to saving user filters in Reports is by storing user filters as JSON in the database. However, I doubt this would work for Record User Filters because a!facet does not include a saveInto, and therefore can not execute local variable saves or database writes.

Hey geervanim , is this possible now in Appian version 24.1?

No in 24.1 it is not possible. but in 24.4 this option is available. 

We can have multiple values as default option in User filter - Refer here