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Yes, you can increase the width of the text box of the Matrix. You can accomplish that by inserting CSS code to your form. So to change the width of the textbox of your Matrix tables you need to insert the next CSS code:
Your Matrix texboxes will become in this way:
You can edit the values 200px and 400px if you need a different size.
Follow the next guide to know how to insert CSS codes: How to inject custom CSS codes
I hope this helps. Please let us know if you need further assistance with this or kindly opena new thread to post unrelated inquiries.