Retaining a central leader shouldn't matter in this case, so you can shape the branches as you wish for now. There are dormant buds along stems (even currently leafless sections) that can generate new growth in future seasons. Pruning also triggers growth from dormant buds, though in this case, we'd advise you wait until spring, when new growth would normally be commencing anyway. Trimming this branch back will likely stimulate not only bud-break at its new tip but also further back down the branch, though we can't say how far. Therefore, trim the branch a little bit below where you want the new growth to fill in, since it will predominantly resume growth from the cut end. Since citrus typically mature fairly large compared with most potted plants we bring inside, periodic trimmings to reduce size will be needed as the plant ages, though it should be easy to do and well-tolerated by the plant. Here's a general page about growing citrus in our area that may be useful: https://extension.umd.edu/resource/growing-dwarf-citrus

Miri