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They won't. Not for the foreseeable future, because Putin is genuinely popular and his party is bolstered by the fact that both the economy and the Ukraine conflict are going well. Describing United Russia as far right is also not accurate, it's more like a catchall for anyone who is not a communist and not a western stooge. It includes some very right wing and nationalistic elements, but they are generally quite careful to marginalize those kinds of far right elements that would be destabilizing for the Russian state:

Ethno-nationalists who would create conflict and friction with Russia's many ethnic minorities, outright Nazis many of whom defected and now fight for Ukraine in Nazi units like the "Russian Volunteer Battalion", etc.

For now the greatest influence the communists can exert comes from their position as the most powerful opposition. It is important to keep it that way and build up the party's social base (its connection to the masses and the labor front) until the united bourgeois front that Putin has built fractures.