Limit Characters for Text Input
This feature lets you set a character limit for Text box, Text area and Email fields.
Steps:
In the Option set , click on the text element you want to adjust.
Find Min character and Max character, and enter the character limit in these fields.
Click Save to finish

Go to the Settings > General Settings
Enable Character count for text box (under Option type setting > Text input). When a Max character is set, a counter such as "12/50 characters" appears under the field.

Final result on storefront:

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