Phpstorm File size exceeds configured limit

In IntelliJ 2016 and newer you can change this setting from the Help menu, Edit Custom Properties

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Maximum file size (kilobytes) IDE should provide code assistance for.

The larger file is the slower its editor works and higher overall system memory requirements are

if code assistance is enabled. Remove this property or set to very large number if you need

code assistance for any files available regardless their size.

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idea.max.intellisense.filesize=2500