Right now we have two choices for actual tables, a 4x2, or a 2x2. At times I currently use a workbench for a 3x1 table against the wall, and place stools or chairs there.
Now Tynan has on his to do list, (taken from a bug report)
Colonists should benefit from chairs at work benches.
Colonists should not eat at work benches.
We need a 1x1 table that we can put together in combinations to create our own sized tables, bars, and counter tops. Also could work as an end table beside chairs.
It'd be nice if the function of the Modular Tables mod was integrated into the core game:
https://ludeon.com/forums/index.php?topic=10623.msg105051#msg105051