If you are trying to change your sources or inputs on the Streamdeck, but the walk through wall doesn't seem to update, you probably have multiple instances of the 8K Viewer running simultaneously. Close out all instances of 8K Viewer on the walk ...
If you are seeing video that's too small on the LED Board even though you have the Streamdeck set to 100% (or full size), AND your video source is HDMI, then the issue is probably an EDID problem. If you are using an HDMI splitter, this is a common ...