To use Page Break Locking, you need to click on its tab.
Unlocked (Normal)—Adding or deleting enough text to create a new Page Break causes pages to renumber automatically.
Locked—Adding or deleting enough text to create a new Page Break makes the existing page numbers stay the same, and generates a new short A-Page.
If you add text to page 38, for example, the text flows over to a new page. This new short page becomes 38A. If the page 38 text flows over to two new pages, the second becomes 38B.
NOTE: Screenwriter displays different page breaks differently:
Normal and A-Page Breaks display as a series of dashes, e.g.:
-----FLEXIBLE A-PAGE-----
Forced Page Breaks and Locked Page Breaks both display as a double dashed line, e.g.:
=====LOCKED PAGE=====
Fixed Page Breaks display as a single unbroken line, e.g.:
=====FIXED A-PAGE=====
The descriptive text contained within the page break line refers to the page following it. It only displays if Display Page Break Type on Screen is checked under Tools > Options > Miscellaneous.
Multi-Locked—Once you have locked your script and added A-Pages, you may want to keep the new A-Page Numbering and give any new pages a new unique number. Checking this option enables you to do so.
Any new page added between existing A-Pages has a number added after it. For example, a page added after page 94B would be numbered 94B1, the next one 94B2, etc.
If a new page is added between a normal page and an A-Page, it is entered using the Multi-Lock Character. For example, a page added after page 67 would become A67 (using the default Multi-Lock Character).