MCreator issue tracker has been migrated to GitHub.
Existing tickets have been migrated to GitHub. Please open new tickets on the GitHub tracker instead. If you do not have a GitHub account, all feature requests and bug reports from forums are still considered and checked by the maintainers.
When biped model is used, MCreator uses standard texture map for biped which is 64x32. There is no way to change this unless you make your own biped model and own texture map in one of the Minecraft mob Java model makers.