Clear/Delete/Override section numbering in a document made from a converted PDF

This JavaScript will successfully remove extra section markers:

/**
 * Remove all section numbering and section markers
 * except for the first page in the active InDesign document.
 * Works in InDesign 2026.
 */

(function () {
    if (app.documents.length === 0) {
        alert("Please open a document first.");
        return;
    }

    var doc = app.activeDocument;
    var sections = doc.sections;

    if (sections.length === 0) {
        alert("No sections found in this document.");
        return;
    }

    // Keep only the first section; remove all others
    for (var i = sections.length - 1; i >= 1; i--) {
        try {
            sections[i].remove();
        } catch (e) {
            $.writeln("Error removing section: " + e);
        }
    }

    // Reset the first section’s properties to make sure it’s clean and intact
    var firstSection = sections[0];
    firstSection.continueNumbering = false;
    firstSection.pageNumberStart = 1;
    firstSection.sectionPrefix = "";
    firstSection.marker = "";
    firstSection.includeSectionPrefix = false;

    alert("All section numbering and markers removed except on the first page. And Mike says hello.");
})();