This mod helps to deal with often low food supplies and garisson deaths related to prosperity in settlements.
You can reduce the prosperity (called population in the mod) of a holding as much as you like. However, it also reduces loyalty proportionally. For example, if you reduce population by 100 and this is 10% of it, loyalty goes down by 10% as well.
Alternatively, if you enable cheat_mode = 1, you can reduce or increase prosperity without negative effects and in any settlement.
You can get it from nexus: https://www.nexusmods.com/mountandblade2bannerlord/mods/259/
Or, if you're building it here, during post build, the Module directory will be mirrored to the Bannerlord module directory (C:\Program Files (x86)\Steam\steamapps\common\Mount & Blade II Bannerlord\Modules\PopulationControl). It may be necessary to set the property GameFolder if Bannerlord is installed at a non-standard path.
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This mod was only possible with these excellent guides to learning bannerlord modding: