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Paige Lin
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Paige, this happens when your Grave / Tilde key (` / ~) is held... perhaps it got stuck somehow?
Can you please try to press it repeatedly, to make sure it’s not a keyboard problem?
On different keyboards this can be a separate key, but it can be a combination as well: https://community.adobe.com/t5/illustrator-discussions/how-do-i-use-tilde-key-function-in-illustrator-from-japanese-keyboard/td-p/10791993