Suppose, you want to show a loading/waiting screen to let people know there’s some heavy processing going on in the back-end and they shouldn’t navigate away to do anything else with the record, you can use loading screen by using showProgressIndicator() and removeProgressIndicatory() methods.
Xrm.Utility methods
There are 2 methods are documented in the Xrm.Utility of Microsoft Docs that you…
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Show Loading Screen in Dynamics 365 using Client API reference – D365 Demystified
Show Loading Screen when your code is busy doing some operation in the backend.
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