Add multiselect for options is in

packages/bbui/src/Form/Multiselect.svelte

@@ -27,7 +27,7 @@
     {error}
     {disabled}
     {readonly}
-    {value}
+    value={Array.isArray(value) ? value : [value]}
     {options}
     {placeholder}
     {sort}

packages/builder/src/components/design/settings/controls/FilterEditor/FilterDrawer.svelte

@@ -140,7 +140,7 @@
               />
             {:else if ["string", "longform", "number", "formula"].includes(filter.type)}
               <Input disabled={filter.noValue} bind:value={filter.value} />
-            {:else if filter.type === "array"}
+            {:else if filter.type === "array" || (filter.type === "options" && filter.operator === "oneOf")}
               <Multiselect
                 disabled={filter.noValue}
                 options={getFieldOptions(filter.field)}