Step1: Open file explorer and browse the following:

C:\Program Files\Riot Vanguard\Logs

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Step2:

In the "Logs" folder select all of the txt documents (Just press ctrl+a in the folder) and then right click and click on delete

(Or select all of the txt documents (Just press ctrl+a in the folder) and press DEL on your keyboard, if you did it this way there would be a popup message saying:

"You'll need to provide administrator permission to delete this file"

then click on/tick "Do this for all current items"

and then click on "Continue")

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Step3:

When you deleted these files there would be an pop up saying

"The action can't be completed because the file is open in System"

just tick "Do this for all current items" (or there would be only a "Skip" button)

and then click on "Skip"

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Step4:

Empty the Recycle Bin

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Side note: Idk if it will work for you, however I found that my fps were way better as well as the input latency and therefore I was more my consistent.

These "Vanguard Logs" are created every time you open the game, so after a while you will need to clear it manually yet again