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If you want to place submit button next to the text box field you will need to Shrink both fields in order to achieve that.
I have checked your recent Form https://www.jotform.com/62524368483361. And it seems you have already got the solution of your query. As in your Form, Submit button appears next to Field on same line.
If you want to do it at another place, please provide us ID of your form so that we can inspect your form and assist you.