"Far left" generally refers to revolutionary communists and others who would oppose capitalism, nationalize industries, etc. — not to a party that seems to define its success in terms of the stock market going up and workers having high employment in private industry. The values and platform of the Democratic Party are solidly in support of globalized capitalism as a system, much more so today than in (e.g.) the FDR administration.

Again: When the stock market goes up and the workers are employed for private industry, the Democrats count that as a good thing for the nation. That is simply not a view compatible with being in the far left.

There's concern about business doing bad things, of course, like wage theft, pollution, or discriminating against minorities — but this doesn't come from anti-capitalism: rather, the view is that capitalism works best when government keeps business honest. The goal is for capitalism to succeed and cause general prosperity — "a rising tide lifts all boats" — not to overthrow capitalism and replace it with a command economy as in Leninism or Maoism.

I would agree that the Republicans have previously been center-right, e.g. in the Reagan and Bush era. However, their embrace of antidemocratic principles (e.g. voting restriction), ideological and tactical alignment with the international far-right (including Putin's Russia), abuse of business regulation to punish political dissent (see DeSantis vs. Disney), targeting of religious and sexual minorities (Muslims, LGBTQ+), harassment & abuse of refugees (see the DeSantis/Abbott human-trafficking campaigns), and embrace of political violence (see alignment with militia and street-fighting groups; also January 6), have all shown a strong migration towards the far-right.

It's possible that the Republicans could return to the center-right, but it would require at least ejecting the outright fascists & felons. Trouble is, those are right at the top. So long as the Republican Party is taking its direction from people like Trump, DeSantis, Greene, or Boebert, it is clearly a far-right party.