In boost theme and Moodle 3.5 in a lesson, the options of the multiple choice questions are not wrapped and the horizontal scroll bar appears.
However, the questions do get wrapped. Don't you think that the answer options should be wrapped?
¡Hola Sergio!
This problem is due to your using the Boost theme. It's a bug in that theme. If you switch to the Clean theme, the problem will disappear.
If you absolutely want to use the Boost theme, you can solve the problem by going to Site administration / Appearance / Themes / Boost / Raw initial SCSS and enter this CSS rule:
#page-mod-lesson-view .answeroption .text-nowrap {
white-space: normal!important;
}
EDIT.- According to Mary's answer in that post it would be preferable to add this CSS rule in the "Raw SCSS" field.