You can show as many as you want, including none.

AND use the 1000 separator option to split the numbers like you want = 13,423.35.
And yes you can't normally have the actual commas, the formating option just puts them there for visual appearance - but if you really want them someone can write you a vba in 1 minute. Keep in mind excel can't work with the numbers normally if they have actual commas in them. You have to duplicate the data in case you want to both work with the numbers and have an output that has them. In case one you can remove them with =SUBSTITUTE() and have VBA or a clever formula put them back in for your final use of the data.
In case of image loss:
Home > Number Format (where it says General) > More Number Formats > Category Number > Decimal Places controller.
If for some reason they get lost on import - just open the csv with something else and copy-paste the numbers into excel.