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One City Mode

This mod adds a mode that disables the ability of all civilizations to receive settlers in any way besides their starting settler: production, gold, faith, etc.

The Settler unit is no longer tagged as a land civilian unit, preventing it from being purchaseable with faith with the Monumentality dedication/policy. Several other properties have also been tweaked to prevent Production and Gold purchases.

Religious Settlements belief now grants 30% faster border expansion vs the usual 15% since it no longer grants a free settler.

If playing with either expansion, Magnus' Provision promotion grants 25% Production toward Industrial Zone units instead of preventing Settlers from consuming 1 population, as this effect is useless without settlers.

Late era starts no longer grant additional settlers, nor does the AI gain additional settlers from higher difficulties.

There is an entry in the rewards table for Tribal Villages that grants a Settler. In normal gameplay, this reward cannot be received, but the entry is deleted to prevent it from being used if other mods would enable it.

(It is possible that other methods of obtaining settlers have been missed; let me know if that is the case and I'll patch it out)

Non-Steam users:
You can download this mod at this link.[drive.google.com]

To install the mod, unzip the folder to the following location:

Documents\My Games\Sid Meier's Civilization VI\Mods

In game:
Click "Additional Content" and make sure this mod is enabled.

[ko-fi.com]