@timott Sounds like you’re using the Shelly Linked Service as the way of integrating Shelly into SmartThings, which is of course the logical way to do it.
If you have Gen1 and/or Gen2 Shelly Devices, you could instead install Edge Drivers and control directly from within SmartThings.
I’m guessing, but not sure, but you might have to disconnect the Shelly Linked Service first. SmartThings > Bottom-Right-Menu > Top-Right-Gear > Linked Services.
I ONLY have the Shelly Edge Drivers installed (not the Linked Service) and this method has worked great for me. Of course, I’m still able to use the Shelly Android App and Shelly Web App to control all of my Shelly Devices.
Here’s the link to the Shelly Edge Drivers Post, with the basic instructions for getting the Edge Drivers enrolled and the Devices found.