Books Panel Does Not Operate as a Standard Panel
The Books panel does not operate in the same manner as other, standard panels. When re-positioned, the panel size is changed, and the Workspace is updated or a new workspace is created, the Books panel does not 'remember' the changes that were placed on it. For the user, this is extremely frustrating behavior. The books panel should, at a minimum, remember its position/size in relation to a given workspace.
That's what they wrote (beneath) ans what it means: We programmed the panel in quite a silly way, with no regards to any user experience and thus are not able to change it anyway. Pay for the software and do not complain about absolutely nonsense development.
Geschlossen · AdminRavi Kiran (Senior Lead Quality Engineer, Adobe InDesign) antwortete · 9. November 2020
Book panel is a special type of panel that is always associated with the .INDB file – unlike other panels where there is no actual association with a file on disk. The panel also shows the name of the Book file. If that INDB file is deleted, then the panel does not have any meaning.
Only when the Book file is opened is the Book panel available. So it can’t be part of a workspace & thus its size and location also can’t be fixed as there could be multiple Book files that can be opened simultaneously.