Hi Peter,
Greetings from Syncfusion support.
We have validated your reported issue with Range Slider component and considered the reported scenario “Enabled and ReadOnly properties are not working properly in Range Slider” as a bug from our end. The fix for this issue will be included in Volume 4 release by the mid of December 2021.
You can track the status of your reported problem through the below portal link.
Until then, we appreciate your patience.
Regards,
Shalini M.