Hi ollie301,
It's a fix that will require some time. Let me explain the reason. Every app needs to have all icons at different levels of resolution in order to work well on certain resolutions. In order for Slicer to have normal size icons on 4k resolution, we need to rebuild all icons at higher res and create some logic that displays these when the system detects really high resolution. Most probably Fusion already did this work, and this is the reason the problem disappeared.
Let us get some more feedback about which resolutions are more frequent, and we'll try to take some action on this.
Thanks for reaching out!
Guillermo Melantoni
Senior Product Line Manager
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