Baylor, the fault was with me, not with BookMaster's layout. I made a mistake adjusting the settings in Text Layout.

Paragraph Aligment was set on FULL, instead of P (Publisher's value). Everything is okay now, as shown below. Thank you for your prompt attention to this matter. BookMaster is a great product and I will continue to use it with pleasure.
I just have one more question/suggestion. If possible I would like to be able to see the time while reading (in the header or footer). I often read during the breaks and it's important to me to know the exact time without additional movements.
Thanks!