A usable window from the moment it opens

Fixed

The window opens at a usable size. It opened at its minimum, where the gallery showed only two columns of thumbnails: you had to enlarge it before you could work. A new window now opens wide enough for five columns with both side panels open, without exceeding a laptop screen. A window you have already sized is left alone.
The sidebar icon rail is balanced: two rows of five instead of one full row followed by three icons. The grouping follows use — browse on top, preserve and configure below — and the two positions a hand memorises, search first and settings last, do not move.

The help centre finally covers the catalogue raisonné and certificates. Neither had a topic: issuing, timestamping, verifying, the register and revocation on one side; works, prints and editions, attribution and provenance on the other. Troubleshooting also documents the two failures actually met in use, with their cause and their way out.