If you have conditional logic applied to a group of questions via a page break or section break, the logic will apply while having one-at-a-time mode turned on.

The same goes with applying logic to individual questions, the logic will still apply while having one-at-a-time mode turned on.

You can easily turn on guided mode by navigating to your Theme & Appearance settings, which can be found in the upper right-hand corner of the form editor.