You can adjust the position of the Next button in Visual Mode.
To switch your survey layout to Visual Mode, please follow these steps:
Login » My Surveys » (select your survey) » Edit » Design » Visual Mode
Once in Visual Mode, you can change the button alignment by navigating to the Customize option.
For more details, please refer to the help article below: https://www.questionpro.com/help/visual-display-mode.html