Hello again Faris,
In order to change your MABS version, you need to go to Service Center -> Factory -> Applications -> Enter in your application -> Distribute Tab.

Then you'll find something like this:
Here you can find the configurations for both iOS and Android builds. If you click in Configure, you'll see your configurations (the same that you have in Service Studio) and you will be able to change your MABS version:

If you pick "Always use the latest version available" option, the platform will use the latest version by default and you don't need to change anything when a new MABS version release comes out. If you select "Specific version", the platform will always use that selected version and you may need to change that same configuration in the future (for example, if that version becomes obsolete or unavailable).
Hope that this helps you!
Kind regards,
Rui Barradas