Quiz

speedy,

With the vanilla Boost theme, the question displays normally, in a similar way as shown above by Visvanath.

The documentation on the Boost 'Union' theme states that the theme is configurable. Maybe your IT people have configured it that way. If you are not a site administrator, you cannot change this behavior for the entire LEARN, but you can attempt to change it for the course you are responsible for with a little CSS as follows:

.formulation .subquestion select {
    width: 150px !important;
}

Note that you need to use the 'Plain text area' editor to edit such CSS style because other editors (Atto, TinyMCE, etc.) will flush it automatically.

Alternatively, you can put the CSS in the form of a JavaScript code, so it does not get flushed by editors:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
    $(".formulation .subquestion select").css("width", "150px !important");
});
</script>

If they work, the above CSS or JavaScript apply to Cloze question's drop-down menus. Other occurrences of full-width menus, for example with other question types, may require a slight adjustment of the above styling.

You can put the above code, CSS or JavaScript, in different places:

• For a single question: in the question text.
• For a single quiz on multiple pages: in a quiz's 'Text' block. Save and configure the block. Set 'Where this block appears/ Display on page types' to 'Any quiz module page' and, in the quiz settings, set 'Appearance/ More.../ Show blocks during quiz attempts' to 'Yes'.
• For the whole course: in a main page's 'Text' block. Save and configure the block. Set 'Where this block appears/ Display on page types' to 'Any page' and, in every quiz settings, set 'Appearance/ More.../ Show blocks during quiz attempts' to 'Yes'.

I could install the 'Boost Union' theme and give you a better and more definitive answer, but I'm a bit short on time. In the meantime, you can try the solution I'm proposing. Adjust the 150px width according to your needs. Obviously, the 'auto' width might work and the '!important' rule may not be necessary (but it doesn't hurt).