Too big for what? Why do you need it to be kb?
Ultimately a twbx is just a zip file that contains both the workbook and the data, so these files are just about as compressed as they can get.
So it's better to change file as .twb?
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Once you changed to twb then it will not store data and local files like images.
Better don't add unwanted columns and if you need some columns that in future then just hide all unused fields and extract.
Thank you Rajan