Armies can only consist of 20 units or less. If you're speaking of increasing the amount of soldiers in each unit, there is a setting for that in the options menu. But you would need to start a new campaign for it to take effect. 1. r/totalwar.
All you need to do is line up the creation of units and and put the command into the console to instantly finish all the units in your recruitment que. Instantly create massive armies with this one I guess. create_unit (General Name) (Unit) (Number Of Troops) create_unit Flavius Julius Velites 100.
Same way: Options -> Graphics -> Click on the gear symbol on the top right -> Lowest entry in that list is about Units, first value is unit size. If you mean you can't start Alexander/Barbarian Invasion at all. -> HOLD down your ctrl key while you click play on the Total War LAUNCHER. That will open the game selection / mod selection menue.
100+ newly remastered units for Greek, Hellenistic and Tracian factions. The largest map in TW history with 1808 cities and regions total, virtually all as heavily researched as possible, and beautifully painted with Kirsi's map textures. A total of 54 playable and 50 unplayable factions with unique UI and banners.
Activating the cheat command is simple. Press the ~ key to open the console command line, type the code, and press Enter. It's also worth noting that codes in Rome Remastered are case sensitive
Auto-Tiling Mode: Check title size for each image ; Press Upscale Image (and go an make a coffee) . Once they are complete you can return to the main Importing RTW units guide for how to link them to the correct model files in the Remaster. Acknowledgements & Thanks ObqbNEV. 83 174 231 264 67 16 267 201 220

rome total war remastered unit size