Java Edition is what used to be called Minecraft (no modifier) and is the edition that runs based on the java language; given the mods you are using, you are almost certainly playing this edition. [Mods are effectively available only for the java edition, although some other editions have some somewhat similar things.]
When Microsoft/Mojang [MS/Mj] decided they wanted Minecraft (unmodified) to apply to another version (generally called bedrock, written in one of the C variants and running under Win10 and various platform systems), they added the "Java Edition" subtitle to the original Minecraft and began calling another edition Minecraft (no modifier). [Engendering confusion in the process. :bletch:]
WRT the original question:
Villagers do not build (or otherwise expand) villages in vanilla (unmodified) Minecraft.
Looking through the documentation/website of the mod that adds this feature would be the best source of information.