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I've opened some assemblies with so many Axis Systems shown, I couldn't see the solid parts! I teach my students to alwaysHide everything but the PartBody(s) before saving a Part file!
The "quick fix" is to use EDIT + SEARCH to find and select all the Axis Systems in all the part instances in the assembly and sub-assemblies, and then you can HIDE them in one operation. Depending on how complex the assembly is, this might take some time to process.
The "permanent solution" is to save every Part file, after you've hidden the Axis Systems, Sketches, Geometric Sets, etc.