you could change the lang string for this text or you could use individual css.
The "Mode" info is in a div block with the class: "feedback_anonymousinfo"
If you use conditional questions you should ensure that at any condition a question or at least a label is shown.
1 have you a car? -> yes/no
3 if yes: what color?
4 if no: why not?
If question 1 is not set mandatory so the answer could be neigher "yes" nor "no".
In this case you have a blank page.
I hope it is that what you ask for
Removing "mode" and blank pages after conditional questions
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