Assuming you and I define the far left similarly, I'm sure you'd agree that the far left is barely even a minuscule fraction of the size of the far right, and with even less of a fraction of the power and influence on the body politic. If I had to venture a guess on the numbers, I'd say the far left makes up maybe two percent of the population, while the far right makes up thirty percent. That's a function of how the far right has completely overrun one of our major political parties.
People like to equivocate and claim the far left has similarly overrun the Democratic Party, to which I can reply only, "come on." The Democrats treat the far left as a wild child who goes prodigal a lot. The party sure would like them to fall in come Election Day, but they can't count on the far left not peeling off in a snit and voting for Jill ****ing Stein instead (as if she were going to save Gaza from Israel).
Democrats don't cave to the far left because the far left isn't reliable, and besides, most of what animates the far left falls well outside the Party's policy positions, anyway. But Republicans must cave to literally everything the far right demands, because they currently hold the entire party hostage.