In the United States, there are 2 major political parties: the Democratic Party and the Republican Party. However, not every vote is cast for one of those parties when other candidates run. In presidential elections from 2004 to 2020 (with the notable exception of 2016), 3rd parties have made up from 0.5% to 2% of the vote combined.
But if you break it down by which 3rd party is being voted for, you find something interesting. In every presidential election from 2008 to 2020, the Libertarian Party (the largest right-wing third party) got significantly more (around 3 times more) votes than the left-wing Green Party. You could even see that in Senate races in 2022.
It seems like since 2008, with the possible exception of 2016 (the right-wing Libertarian Party got half of the third party votes even then when a historic number of left-wing 3rd party votes were cast so it could have held true in 2016 too), third party voters seemed to have a conservative bent. Not all small-l libertarians are conservative, but the Libertarian Party leans right decisively.