My tools are not working for MCreator 2021.1

The tools that were you make the texture and the new blocks are not working. In the picture that I will send you can see that by the arrow the Java 3D model is not turning blue, the color I picked for it. I press it over and over again and nothing happens. Is there something I am missing or is this a bug? Please fix it or tell me how to use the tools. Should I try and download it again or get an older version. I will try to send the photo in the comments, because here is not working. This is MCreator for Mac version 2021.1