There is no confirmed DREADMOOR-specific repair for a second-monitor resolution problem here. Do not begin by deleting saves or copying launch flags from another game's troubleshooting thread. First identify whether the problem affects the whole display, only the game image, or only its interface.
Record the display state before changing it
Write down which monitor the game opens on, the resolution you expected and the result you actually see. Distinguish a blurry image from a cropped image, a stretched interface, an unsupported-resolution message or a window appearing on the wrong screen. Those descriptions identify different symptoms; calling all of them a resolution bug makes the report harder to reproduce.
When describing a display problem, distinguish the 3D image from the interface; this image is not a demonstration of a fault.
If you compare two launches, change only one relevant condition at a time and record it. For example, note whether the problem begins immediately or only after moving the game between displays. This is a diagnostic comparison, not a promise that moving a window repairs the game.
Keep unrelated save advice separate
The demo's old-playtest-save warning concerns bugs and crashes when continuing earlier progress. It does not establish that deleting the Saved folder fixes multi-monitor scaling. Preserve your progress while investigating a display complaint.
Similarly, the published PC requirements do not define a supported combination of different monitor resolutions. Meeting them does not identify the cause of this symptom.
Send a report that can be reproduced
Use the demo's in-game reporting option and include the application name, game build if shown, operating system, GPU, both display resolutions and the exact sequence that triggers the problem. Attach a screenshot that includes the affected interface or error text where possible.
A report that says the game becomes cropped after moving from one named display to another is more actionable than one that only says the graphics look wrong. Until a game-specific repair is verified, avoid presenting configuration-file edits, driver changes or a save reset as a proven solution.