Hi there,
For those who may have wondered why the viewer doesn’t work I found there is a trick to getting it going in some browsers, what I have is Chrome “Version 120.0.6099.130 (Official Build) (64-bit)”
Once you navigate to the Device WIKi page at the right is says Online Schematic Viewer.
Seeed LQQK (@ my suggested fix at the end) You always have to scroll wheel up or Page down to the Viewer area. If you don’t hit it just prefect or fail to align the edges in the Viewport of the Browser window it won’t GO! See the pictures attached.(HTML?active X ,code failure to launch.
Then Right CLICK
Select RELOAD option… After it clears and say’s initializing it will appear in schematic view.
Picking any of the options re-displays and it works quite well
Board is NICE option to the right for download etc.
BOM is Cool Too!
HTH
GL
PJ 
SEEED, Put some code on the link that centers the PAGE if you use the navigation on the right or ALERT the user of this Browser shortcoming and centering requirement…