How to configure Custom Item Sets in the new client:

If you're like me and you have a few items that you want to swap out from the recommended or existing item set: Open your custom item set folders in C:\Riot Games\League of Legends\Config\Champions\ Open the champion's folder, open the JSON file with "open with" and select the standard Editor to open the item set Use this website to find which item has which ID and simply swap the ID with the one you want.
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