The loading screen isn't specific to Electron. You achieve it with the usual javascript.
I did a simple version in my Creating a movie website with GraphQL and React tutorial, where whilst waiting for the resources to load, show the word "loading" (I didn't bother to style it).
Since it's not specific to Electron I am not going to cover it here.
You can see the demo of the loading (all be it with no styles) here
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The loading screen isn't specific to Electron. You achieve it with the usual javascript.
I did a simple version in my Creating a movie website with GraphQL and React tutorial, where whilst waiting for the resources to load, show the word "loading" (I didn't bother to style it).
Since it's not specific to Electron I am not going to cover it here.
You can see the demo of the loading (all be it with no styles) here