A "complete" experience with version 18 meant mastering its then-new features that aimed to keep architects in the "flow":

: Version 18 users occasionally reported "crashing" during installation or performance issues like slow 3D rendering if hardware wasn't properly optimized. Archicad 18 VERY SLOW - Graphisoft Community

: You can customize story names, elevations, and heights through the Story Settings dialog box, which allows you to insert or remove levels as your design evolves.