In your mods folder I would like to be able to organize my mods I am using with folders of the version number that they should be used/loading in when Fabric loads as the name of the folder.

Example

mods -
          |-1.16.0 -| "fabric-api-0.24.0+build.411-1.16"
          |             | "litematica-fabric-1.16.0-0.0.0-dev.20200913.215807"
          |
          |-1.16.3 -| "fabric-api-0.24.0+build.411-1.16"
                        | "litematica-fabric-1.16.3-0.0.0-dev.20200913.215807"

You can use MultiMC to manage mod versions easily. Also, this is the repository for fabric API (yeah, it's confusing).

Duplicate of this issue on Fabric Loader: FabricMC/fabric-loader#181

oh really! I dislike MultiMC so that is not an Option. I will look into how to use the launcher to support this. I looked but I guess I missed #118 sorry for the confusion! Have a good one.

Duplicate issue, even the vanilla launcher supports a way to safely seprate instances.