As default http://<hostname>/<LOGBOOK> shows the Summary View.
Clicking in "Full" changes the URL to http://<hostname>/<LOGBOOK>/?mode=full.
But now the URL http://<hostname>/<LOGBOOK> show the Full view as default.
I think the URL without ?mode=... should show every time the same result,
regardless the view used before. Or maybe I can configure, which view I want to
see if I use the URL w/o ?mode=... The option to hide/show attachments is affected too.

Example:
Default view mode = 0 | 1 | 2 | 3
0 = remember last used (default)
1 = Summary
2 = Full
3 = Threaded


Default attachment mode = 0 | 1 | 2
0 = remember last used (default)
1 = Hide attachment
2 = Show Attachment