Changing your Trim Size You can change this in your theme settings Go to the formatting tab, select the three dots next to your theme, and then select "edit as new theme."β Next, go to trim sizes and select your trim size. We hope this helps! Related ArticlesHow can I adjust the size of indents?How Do I Control Note Placement and Text Size?How do I increase the font size for paragraphs?How do I select my trim size (page size)?Why are changes to my formatting options syncing to multiple books?