You get an empty page when testing the questionnaire, although you have placed at least one question on each page. Then this is due to the questionnaire dynamics and used functions such as branching or conditional visibility. Therefore, please check the questionnaire dynamics for correctness.
A typical example: The empty page appears after a filter question. You have placed one or more questions on the page in question with conditional visibilities. Now, if those conditions are true that cause the questions not to be displayed, then nothing will be displayed on that page at all and it will remain blank.
In such a case, you can do the following: set the visibility conditions that you applied to the questions on the page and remove the conditions on the questions. Then these conditions will apply to the whole page and it will not remain empty. To do this, use the eye icon at the top right of the page.
Visibility conditions are predominantly applied to questions in order to specifically show and hide them. Depending on the questionnaire, however, it may be necessary for visibilities to apply to an entire page.
You can find more information about the functions of the questionnaire dynamics in our helpdesk: Conditional visibilities and branching.