Hi.
The sign is not displayed.
https://snippet.dhtmlx.com/w773fd8g
Thank you for your report.
The problem is confirmed. We’ll try to fix it in one of the future updates.
Your reported problem was fixed in the latest (7.3 ver) dhx.Suite update.
You can check it in your original snippet.
Please, try to download the latest dhx build to get that fix
Thank you for your report.