@am4c130d In the scheduled OFF event, select "Fade Off" and you can select up to 30 minutes. Beware that it is not a smooth fade. There are discrete brightness levels and it's easily visible when the levels change. For example, a 30-minute fade will reduce the brightness by 1% approximately every 18 seconds. You will see the light switch brightness levels every 18 seconds. For me it's almost the same appearance as blinking my eyes.

  @Wipipo thank you for the suggestions. Either I'm completely missing it, or that option isn't available, please see screenshot from my phone for schedule on that switch.

Thanks

I'm concluding this is not a feature supported by these switches as no one from TP Link has responded/commented. I also tried HS220 dimmer switches, they don't support this feature either. I've reached out to Support/sales to ask which smart switches support this feature, they haven't replied. I now wonder if this is an app feature, not a switch feature, so it will never work if the app doesn't expose it.

TP-Link posted this article over 2 years ago https://www.tp-link.com/hk/blog/1245/start-your-circadian-rhythm-with-sunrise-and-sunset-function/ and it doesn't mention any specific model of smart switch (but it does show a KS220m in the images), so I assumed it was broadly applicable.

Is anyone using a TP-Link smart dimmer switch to do this with regular dimmable lights? If so, which model worked? Thanks again for any help.