D&D 5E Do you restrict racial choices in your games?

[TwoSix]

Does anyone ever restrict number of races in a party? As in you say humans and dwarves are common so as many players as want to play either can do so, but dragonborn, elves, and gnomes are uncommon/rare so no more than 1 of each race can be selected. Then in game, the NPC demographics somewhat match so that the players commonly interact with humans and dwarves but only rarely come across the other 3 races and normally only as individuals or very small enclaves.

If anything, I slightly encourage it. A paired (or more) group of non-humans races encourages the players to highlight their shared background. It becomes much more notable in play than your generic half-human, half-Mos Eisley party.