When you originally set engine.loadingUIText, the text looks like this:
However, this does not currently work with the latest version of babylon.js.
I think this PR is probably the cause.
Here is the PR for reproduction.
I personally don’t mind backwards compatibility being broken,
just want it to be possible to show the loading text again…
I just checked the fix PR.
It’s a feature that I don’t use, but all pg using custom loading screen doesn’t seem to work.
It would be good to check this additionally.
@SimoneDev
Oh, it’s my fault! This PR should fix the bug:
Meantime, as workaround, you can set the engine.loadingUIText
before display the loading screen. A repro sample:
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Thank you for your quick response 
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Basically is changed the underlying structure to allow the show/hide of the loading screen on multiple canvas.
Here the updated playgrounds from documentation Creating Custom Loading Screens:
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[PG] Simple example showing how to create and use a custom loading screen.
https://playground.babylonjs.com/#5Y2GIC#847
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[PG] Example showing how to get a loading rate for multiple assets.
https://playground.babylonjs.com/#BCU1XR#7895
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Here the PR that updates the playgrounds in the documentation:
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Here the PR that updates the breaking changes section in the documentation:
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Thanks for the issue tracking
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