The more proper way to do this, is for the system to validate the hydraulics of it.
Which means it is a matter of Velocity, or Demand. You can add a Cap in order to create more demand, or you can slow the Velocity in order to force a larger pipe size.

--J

Yes that is true, but I have found in certain cases it can be tricky when designing with loops. Also from time to time I may want to upsize a section for future expansions. How does LFX handle it when placing a quick coupler say on a baseball field? There is no flow data attached to the QC so adding a cap and and then sizing and then erasing the cap so it won't be in the legend can be cumbersome. Don't get me wrong. I like the auto size function and use it. I would just like to have more flexibility when manually adjusting for my purposes. Admittedly I am still trying to wrap my head around flow zones as well.