An app or website should always keep users informed about what is going on.
Users want to know their current context in a system at any given time and apps shouldn’t keep them guessing.
The best practice would be to tell the user what’s happening via appropriate visual feedback.
Providing instant visual feedback, such as an animated indicator when a user initiates an operation, is a great way to inform users that an interface is working.
You can know more about UX and UI here: https://xd.adobe.com/ideas/career-tips/15-rules-every-ux-designer-know/
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