The min / max buttons are part of the container, so if you can edit the container file, you can easily delete them.
Locate the <dnn:VISIBILITY ... /> in the container file and delete it. The container file will be located in one of the Portals subdirectories (most likely, _default , but possibly in the directory of the specific site on which the containers are installed). From this directory, find Containers\[ContainerName] and then the .ascx file for the container (s) that you want to modify.
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