Change the column from Size (auto) to Size (bytes) in your Folder Formats.
Alternatively, if you're like me and like the "auto" version most of the time but occasionally want to see the exact byte sizes, you could create a button/hotkey/etc. which runs this to temporarily toggle between the two modes:
Set COLUMNSTOGGLE=sizeauto(1)
Set COLUMNSTOGGLE=size(1)