How to remove p-multiselect filter from options with having search input

I want my primeng multiselect to have a search/filter input, which I added via <p-multiselect [filter]="'true'" [options]="selectOptions"></p-multiselect>. And when user type value in filter input, I get new data with api, and refresh selectOptions. But p-multiselect is doing filter on my options, and shows options without some items.

Tell me please how can I have that filter input, without dafault filter function?

Now I just refresh that options data, but I dont get the result I wont

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