How to fix «The file size exceeds configured limit» / «Code insight features are not available» in IntelliJ IDEA?

IntelliJ IDEA
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Step 1

Open the menu item: «Help» → «Edit Custom Properties»:
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Step 2

Set the parameter:

idea.max.intellisense.filesize=999999

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Step 3

Restart IntelliJ IDEA.

stackoverflow.com/a/42147946