When playing around in a regular sandbox with the blueprint sandboxes mod, the utilization monitor is not present. Please add support for blueprint sandboxes.
https://mods.factorio.com/mod/blueprint-sandboxes

Interesting mod - verified there's something weird with the interaction between UMB and it. Entities are created under a different force ("bpsb-sb-f-player") so I would have expected disabling the "check only player force" option to fix it, but something's still not working.

Looking into it now.

Found the problem - a bug in UMB where that option ("Only track the 'player' force") wasn't actually working.

Fixed in 0.8.12.

Just a note, you will need to uncheck "Only track the 'player' force" when using that mod.

I knew the sandbox was using a different "force" acting as the same player's force, but didn't know it would affect things. Thanks for the fix and clarifications.