A recent publication from Florida has some really good guidelines and images on citrus pruning: https://ask.ifas.ufl.edu/publication/SS698
Management of Citrus Tree Canopies for Fresh-Fruit Production
Andrew Krajewski, Arnold Schumann, Tim Ebert, Chris Oswalt, Rhuanito S. Ferrarezi, and Laura Waldo
Canopy management for citrus has two components: selective pruning, and management of the resulting vegetative regrowth. Selective pruning means pruning trees at the correct time in their phenological cycle. Correct cutting techniques are used to remove only specific, unwanted branches. Regrowth management usually consists of thinning out excess vegetative shoots resulting from pruning. Where appropriate, it may also involve the bending of upright, very vigorous, but otherwise well-placed watershoots to hasten their transition to bearing. Canopy management is a useful tool to induce precocity and maintain high production of optimum-sized, high-quality fruit. It also helps other management practices (e.g., interrow access; fertigation and servicing of irrigation systems; scouting; pest and disease sprays; weed management; and grove sanitation and harvest). Correct canopy management of both nonbearing and bearing trees is especially important in higher-density planting systems such as CUPS (Citrus Under Protective Screen; Schumann et al. 2017), where crowding and shading are issues requiring management if trees are to produce sustained and consistent high yields of uniformly excellent fruit. The aim of this article is to provide growers with practical tools with which to manage their trees for maximum fresh-fruit yield, quality, and profitability.