yanqele

Thanks John
At least for me, this is not urgent, as the print buttn opens the extra features.
Also I found in the doc an alternate solution using an onClick statement.
Many many thanks.

Getting a blank window is often, not always, caused by lack of completion of a piece of PHP code, for example due to a missing file.
With blank windows what I always do first because I use WordPress stand alone under Linux, on my own PC, is to immediately look at the end of the Apache server error log, command : tail /var/log/httpd/error_log
This path holds for a Fedora distro, may otherwise slightly differ, with /var/log a quite standard beginning.
This is by the way not particular to WP but to PHP or other Web softare debugging.

Add an entry to menu principale (the e is a mistype, not by me) for example.
Add a submenu for each category to be separately displayed.
I am not the inventor of that method.

To combine categories use plugin LastArticles where this particular feature is undocumented.

I accidentally found out that this plugin has the required capability because it uses the PHP function get_posts which allows “category” to be a comma separated order-independent list of valid categories. I tried and it worked right away.

Took some time to the newcomer I am to figure out.

Set a menu entry and then as many subentries as categories to be displayed.

I am not the inventor,