Mendix Studio always uses the newest Mendix version when creating a new project. If you want to create an older version, as you seem to be trying, you will have to do this using your local Mendix Studio Pro from the Studio Pro version that you want the project to be.
Just out of curiosity ……...while using mendix studio, if a new app is created it will be created in the latest Mendix version, but if you open an existing app created in some old version, it opens it successfully too, does this mean :
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Hi Taylor,
For Studio Pro, there is one working copy for each development line of the app. This model is held locally, on each computer where development work is taking place.
For Studio, there is one additional working copy, held in the cloud. Only one developer at a time can edit this.
If Studio is ENABLED for this development line, the process first ensures that the Studio working copy is stored as a new revision and merged into the working copy of Studio Pro. If there are no conflicts, the changes are then sent to the repository to make a new revision.
You can find more details about this topic in below document
https://docs.mendix.com/refguide/version-control/
Thanks
Taylor,