I have this problem:

There is too much space between the question and the answer.

The next button is too low and there is the need to scroll down in order to click the button.

Is there a way to compact the question (deleting some blank space) or to locate the NEXT button in a higher position? (so that the participant does not have to scroll down to click in it?

We have no way of answering that without knowing what LimeSurvey version and template you are using and, preferably, seeing a live test survey.

I am having this problem as well,
I would like the "next" and "previous" button in a higher position (so that the participant does not have to scroll down to click in it).
I´m using LS Versão 2.50+ Build 160718 and Default template.
pesqinst.trtsp.jus.br/limesurvey/index.php/127445
Thank you.

See this post about removing some of the extra spacing - www.limesurvey.org/forum/design-issues/1...een-questions#139419