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.
You just need to wait for a while. When you switch the workspace, MCreator builds it and while it is building it, you can not switch to the other workspace so it disables these buttons. After the building is done (green gear button turns to white), they are enabled back.