Changing the chapter font size is not supported by Report Generator out-of-the-box, however, the modified stylesheet that is attached will allow you to control the chapter title font sizes through the GUI (there is a new value called 'Chapter Titlepage Recto Style' which can be modified).
Note that there may be an unrelated caching issue: if you run the report, modify the stylesheet and rerun the report, you may not see your latest stylesheet changes. If this becomes an issue, you can either close and reopen MATLAB or call
com.mathworks.toolbox.rptgencore.output.StylesheetCache.clearCachedStylesheet
from the command line to refresh the cache.
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