It should be scoreboard.objectives.setdisplay. Nothing else that I know of in the library takes the lowercase of vanilla Minecraft syntax and turns it into camel case where there are officially multiple words. For example, datapack, gamerule, tellraw, playsound, teammsg, setworldspawn, gamemode, etc. are all lowercase despite officially containing multiple words. So why isn't setdisplay?
It should be
scoreboard.objectives.setdisplay. Nothing else that I know of in the library takes the lowercase of vanilla Minecraft syntax and turns it into camel case where there are officially multiple words. For example,datapack,gamerule,tellraw,playsound,teammsg,setworldspawn,gamemode, etc. are all lowercase despite officially containing multiple words. So why isn'tsetdisplay?