To change the code indent size in Maple, users typically rely on the spacebar for indentation. However, the default indent size may not meet their preferences, leading some to suggest using two spaces for each indent. There is a consensus that Maple does not provide an option to customize the indent size directly. Users are encouraged to adapt their coding style by manually adjusting the number of spaces used for indentation. Ultimately, Maple's indentation capabilities are limited, requiring users to find workarounds.