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Thumbnail size & 4K

Please increase max thumbnail size from 320px to 640px.

The default maximum scales with DPI, and you can increase it to an arbitrary size via Preferences / Misc / Advanced.

Note that it will also increase memory usage, sometimes quite significantly.

okay. thankyou.

Preferences / Miscellaneous / Advanced: [Limits] max_thumbnail_size is the setting, now I'm back at my PC.