Can you please share a screenshot of your Roon Settings -> Audio tab (which shows this device) and also a screenshot of your Device Setup info for this zone? You can access the device setup tab in the Audio screen by pressing the “cogwheel” icon next to the SE100 and then pressing Device Setup.
What exactly do you mean by “the settings are not right”? Can you clarify? Is this affecting MQA content or is just the sample rate different than what you expect it to be? What does Signal Path display, can you share a screenshot of this as well?
Thank you for sharing those screenshots. Under DSD Playback Strategy, I would try DoP. As for MQA support, we have been unable to determine this information from the manual, you should reach out directly to Astell & Kern for more information in this aspect.