Numbers in data tables can be hard to read, because they are always left-aligned and have no digit grouping.
Some results may have big numbers which are hard to read without proper formatting.
Digit grouping:
466533234 vs 466.533.234
see https://community.graylog.org/t/display-thousands-separator-in-aggregation-tables/
Decimal Alignment:
https://i.stack.imgur.com/x9qvF.png

Just for the problem visualization
Thanks for your support with this issue.
Two more comments:
Even I brought up in the Graylog Forum as an example a "dot" as a thousands separator (which would be the standard in Germany where I live) I believe a "comma" would be the better separator to avoid mixing it up with the decimal point (which is more or less IT standard) and to not make it look like an IP address.
Besides the thousands separator it would be better to justify all numeric values "right" instead of left.
So for the Sum (rcv) column in the above screenshot:
now

improved

Most helpful comment
Thanks for your support with this issue.
Two more comments:
Even I brought up in the Graylog Forum as an example a "dot" as a thousands separator (which would be the standard in Germany where I live) I believe a "comma" would be the better separator to avoid mixing it up with the decimal point (which is more or less IT standard) and to not make it look like an IP address.
Besides the thousands separator it would be better to justify all numeric values "right" instead of left.
So for the Sum (rcv) column in the above screenshot:
now

improved
