Currently it is not possible to adjust the font size or formatting of your step titles because we use a pre-set design. This means that if your step title is too long, it may roll over to the next line.

And you are unable to adjust the step titles in the Travel Book Editor, so you must first do so in the trip itself. To edit the Step name, go into the trip in your account --> find the step --> edit step --> adjust the title --> publish step. 

Then, the next time you generate your Travel Book preview the new step title will appear again!