how can I use multiple filter for recordfilter list?

Can you give us a bit more detail? What did you try?

So the filter I am adding is not in the cdt, I added custom filter options and one option can have two different query filters. When I add two filters, appian skipped the second filter.
for example:

a!recordFilterListOption(
id:1,
name:"Show my tasks only",
filter:{
a!queryFilter(
field:assignedTo
operator:"=",
value:loggedInUser()
),
if(a!isUserMemberOfGroup(
username:loggedInUser(),
groups:{}),

a!queryFilter(
field: status
operator: "=",
value: cons!STATUS_RETURNED
),
{}
)
}
),

So the filter I am adding is not in the cdt, I added custom filter options and one option can have two different query filters. When I add two filters, appian skipped the second filter.
for example:

a!recordFilterListOption(
id:1,
name:"Show my tasks only",
filter:{
a!queryFilter(
field:assignedTo
operator:"=",
value:loggedInUser()
),
if(a!isUserMemberOfGroup(
username:loggedInUser(),
groups:{}),

a!queryFilter(
field: status
operator: "=",
value: cons!STATUS_RETURNED
),
{}
)
}
),

Is it intentional with line 13? a "}" is missing

a!recordFilterListOption(
    id:1,
    name:"Show my tasks only",
    filter:{
        a!queryFilter(
            field:assignedTo
            operator:"=",
            value:loggedInUser()
        ),
        if(
            a!isUserMemberOfGroup(
                username:loggedInUser(),
                groups:{
            ),
            a!queryFilter(
                field: status
                operator: "=",
                value: cons!STATUS_RETURNED
            ),
            {}
        )
    }
)

yeah its {} I removed the sensitive information from the code

A filter list option does only support a single queryFilter.

just to understand, you miss the effect of the second query filter or as second option to choose from as option?

I miss somehow the "" for the field values (as it has to be string)

a!queryFilter(
field: "status"
operator: "=",
value: cons!STATUS_RETURNED
)

ah yes. always forget that. the parameter of the option already shows it 
its "filter" as parameter not "filters"

is there any way we can achieve this in record filter? my client wants the filter dropdown align with the record search bar, that's why the custom dropdown doesn't work here