Shelf Preview Icons of Extension Pack Textures are very small
Mari 4.7 introduced a new Shelf, offering 'Mouse Over' Preview Thumbnails of Images, Materials etc.
The new shelf generates Image Previews at much higher resolution than previous Mari Versions.
If you have installed and used Mari Extension Pack in a previous Mari Version, the Preview Thumbnails are picked up
by Mari 4.7+ from that old version.
To fix this
- Delete the Folder 'Thumbnails'
- ~/.config/TheFoundry (on Linux, ~ refers to your home directory),
- \user\username\.mari\TheFoundry (on Windows),
- ~/.config/TheFoundry (on Mac, ~ refers to your home directory).