Filtering a dataset based on a text value and a boolean

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Hi, I found this thread close to solving my issue. My case varies as follows;

I have dropdown filters run by velo code. This overwrites the filters set via dataset settings, whenever a dropdown option is selected. How do I maintain a boolean filter fixed always?

(I have several DD filters combined, I’ve shown only one below)

import wixData from 'wix-data';

$w.onReady(async function () {
    await setupCountriesDropdown();
    setupSubjectDropdown();
});

function setupSubjectDropdown() {
    $w("#subjectDropdown").onChange(filterAndApply);
}

async function filterAndApply() {
    let filter = wixData.filter();

    const subject = $w("#subjectDropdown").value;
    if (subject) {
        filter = filter.ge("subjects", subject);
    }

    $w("#listingsDataset").setFilter(filter);
}