The commands will have the command block type, and order they should be in. the top few are in chat commands for those who dont know.

In chat:
give @s command_block

scoreboard objectives add c dummy

scoreboard objectives add c2 dummy

scoreboard objectives setdisplay sidebar c

Command blocks:

Scoreboard players reset * c | Repeating cmd block

Scoreboard players set @e[type=(mob)/(space_name)] c2 1 | Chain cmd block

scoreboard players operation "count" c += @e[type=(mob)] c2

scoreboard players reset @e c | chain cmd block

make sure to have all chain command blocks powered or always active. Put the commands I gave in the order from top to bottom. Make sure chain command blocks are right next to the repeating command block where it is facing and facing the same direction. Anyone who needs help just ask.

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