I would like to inform you that the force validation is triggered at the page break, the respondents will not be able to proceed to the next page of the survey or submit the survey (in case of a single-page survey) if they have any questions unanswered. For all the unanswered questions, a warning would appear asking them to answer the particular question (screenshot: https://prnt.sc/yHJ_AXNEvjP1).
If you want the validation to appear right after the question, then you might consider adding a page break after every question. To know more about page breaks, please check: https://www.questionpro.com/help/page-breaks.html