How can I revert a control change to my "A" key?

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I changed my a key to "Select" so now I can’t re-change a to "Left" due to the fact that when I try to click any options on the right, it moves to the add on the left.
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How do you reverse a Control Z action?
To reverse your last action, press CTRL+Z. You can reverse more than one action. To reverse your last Undo, press CTRL+Y. You can reverse more than one action that has been undone.How do I undo keyboard changes?
To undo an action, press Ctrl + Z. To redo an undone action, press Ctrl + Y.How do I remove Ctrl Shift 8 in Word?
Go to the Commands list and select the item you want to remove the shortcut from. Keyboard shortcuts that are currently assigned to that command appear in the Current Keys list or below the box labeled Currently assigned to. Highlight the shortcut in the Current Keys box and select Remove. Select Close.How do I redo the Ctrl key?
Redo an action To redo something you've undone, press Ctrl+Y or F4. (If F4 doesn't seem to work, you may need to press the F-Lock key or Fn Key, then F4).Computer Fundamentals - Undo \u0026 Redo Shortcut Keys - ctrl Z Control Z ctrl+z ctrl-z ctrl + Z ctrl y
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