Hi Mike,
I have made a simple code example to showcase you how to disable row expanding on certain rows depending on a condition.
//In your Js File:

const chemicalElementsData = [
    { number: 1, name: 'Hydrogen', symbol: 'H', weight: 1.008, abundance: 1400, originOfName: 'Greek elements hydro- and -gen, \'water-forming\'' },
    { number: 2, name: 'Helium', symbol: 'He', weight: 4.002602, abundance: 0.008, originOfName: 'Greek hḗlios, \'sun\'' },
    { number: 3, name: 'Lithium', symbol: 'Li', weight: 6.94, abundance: 20, originOfName: 'Greek líthos, \'stone\'' },
    { number: 4, name: 'Beryllium', symbol: 'Be', weight: 9.0121831, abundance: 2.8, originOfName: 'Beryl, a mineral (ultimately from the name of Belur in southern India)' },
    { number: 5, name: 'Boron', symbol: 'B', weight: 10.81, abundance: 10, originOfName: 'Borax, a mineral (from Arabic bawraq)' },
    { number: 6, name: 'Carbon', symbol: 'C', weight: 12.011, abundance: 200, originOfName: 'Latin carbo, \'coal\'' },
    { number: 7, name: 'Nitrogen', symbol: 'N', weight: 14.007, abundance: 19, originOfName: 'Greek nítron and -gen, \'niter-forming\'' },
    { number: 8, name: 'Oxygen', symbol: 'O', weight: 15.999, abundance: 461000, originOfName: 'Greek oxy- and -gen, \'acid-forming\'' },
    { number: 9, name: 'Fluorine', symbol: 'F', weight: 18.998403163, abundance: 585, originOfName: 'Latin fluere, \'to flow\'' },
    { number: 10, name: 'Neon', symbol: 'Ne', weight: 20.1797, abundance: 0.005, originOfName: 'Greek néon, \'new\'' }
];
window.JQX('#table', class {
    get properties() {
        return {
            dataSource: new window.JQX.DataAdapter({
                dataSource: chemicalElementsData,
                dataFields: [
                    'number: number',
                    'name: string',
                    'symbol: string',
                    'weight: number',
                    'abundance: number',
                    'originOfName: string'
                ]
            }),
            keyboardNavigation: true,
            rowDetailTemplate:'
<div class="element-cell">
                    <div class="element-no">{{number}}</div>
                    <div class="element-symbol">{{symbol}}</div>
                    <div class="element-name">{{name}}</div>
                    <div class="element-weight">{{weight}}</div>
                </div>
                <div><strong>Origin of name:</strong> {{originOfName}}</div>',
            columns: [
                { label: 'No.', dataField: 'number', dataType: 'number', width: 50 },
                { label: 'Name', dataField: 'name', dataType: 'string', width: 200 },
                { label: 'Symbol', dataField: 'symbol', dataType: 'string', width: 150 },
                {
                    label: 'Weight', dataField: 'weight', dataType: 'number', width: 200, formatFunction(settings) {
                        settings.template = new window.JQX.Utilities.NumberRenderer().formatNumber(settings.value, 'F2');
                    }
                },
                {
                    label: 'Abundance', dataField: 'abundance', dataType: 'number', width: 200, formatFunction(settings) {
                        settings.template = settings.value + ' mg/kg';
                    }
                }
            ]
        };
    }
});
window.onload= function (){
    const table = document.getElementById('table');
    const expandedRow = document.querySelectorAll('jqx-table[row-detail-template] tr[row-id]')
        for( let rowIndex = 0 ; rowIndex <expandedRow.length ; rowIndex++){
            let cellValue = table.getValue(rowIndex,'weight')
            if(cellValue <10){
                expandedRow[rowIndex].style.pointerEvents = 'none'
            }
        }
}

And in you HTML file :
<smart-table id="table"></smart-table>
For base for this code snippet I used this demo: https://www.htmlelements.com/demos/table/expandable-rows/
Please, do not hesitate to contact us if you have any additional questions.
Best regards,
Yavor Dashev
Smart UI Team
https://www.htmlelements.com/