calibre 4.21 & calibre Portable 4.21 Released

[mrtrout]

https://calibre-ebook.com/whats-new        Release: 4.21 [16 Jul, 2020]
New features
Kobo driver: Add support for the new Kobo Nia
Cover grid: Vertically center covers that are smaller than the available space.
Closes tickets: 1886731

Quickview panel: Add a checkbox to easily toggle if virtual libraries are respected.
Closes tickets: 1886347

When creating custom columns allow specifying a default value to be applied to new books for that column
Closes tickets: 1886079           https://www.fosshub.com/Calibre.html      https://www.fosshub.com/Calibre.html?dwl...4.21.0.msi          https://www.fosshub.com/Calibre.html?dwl...4.21.0.msi            https://www.fosshub.com/Calibre.html?dwl...4.21.0.exe