Why is Webstorm throwing an error? How to set it up?

Question

webstorm

I'm trying to master webstorm, the question arose - why in the for loop does he suggest declaring a variable before the loop? And that means he stubbornly offers me to declare let before the cycle. As far as I understand, this is from ES5, but in general, exclusively codestyle. In the settings I did not find how to cancel. And yet, does anyone have a guide for setting up this IDE in Russian? Found in English, but still hard to set up.
for(let i = 0; i <= arr.length; i++) {}

Answer 1

Place the cursor where the error is and press alt + enter. From the dropdown menu select "turn off this rule"