Always in all caps. It tells the reader where and when the scene takes place. It starts with (Interior) or (Exterior), followed by the location and the time of day. INT. COFFEE SHOP - DAY
A script in follows the industry-standard "Master Scene Heading" format. The software is designed to handle the heavy lifting of indentation and capitalization automatically, allowing you to focus on the story rather than the margins. Core Formatting Elements celtx script format
When you are in an Action block and hit "Tab" or select "Character" from the dropdown, Celtx jumps to the correct indentation (roughly 3.7 inches from the left margin) and capitalizes the name. This distinct visual separation allows actors to quickly scan the page for their cues. Always in all caps