Steps on how to bind attack move to left mouse button:
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Open 'Riot Games' folder
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Open the following 'League of Legends' folder
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Open the 'Config' folder
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Open the 'input' file
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Edit the file to your preferences.
Part 1
Under [GameEvents] paste the lines:
evtPlayerAttackMoveClick = [Button 1]
evtPlayerSelectClick = [Shift][Button 1]
This will bind attack move to your left mouse button. You will need to use Shift + Left click to click on hud related stuff e.g., the shop, scoreboard, minimap.
Part 2
Under [HUDEvents] paste the lines:
evtOnUIMouse1 = [Button 1], [Shift][Button 1]
evtOnUIMouse2 = [Button 2]
evntHudMoveableSelect = [Button 3]
This indicates that you can interact with HUD related features using both left mouse button or shift + left mouse button. The moveable select is now binded to your middle mouse button. This is used to click and scroll the minimap.
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Note: If [GameEvents] and/or [HUDEvents] does not exist already you simply paste it in._
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Save the file.
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Delete the PersistedSettings.json file. Do not worry this file will automatically re-create itself the next time you play a game.
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If your client was open during all of this, restart it. If not, start it up and test out your new settings in a custom game.
Enjoy :)