I just tested it. It looks like it needs to set Links in Preferences -> Environment as Absolute before creating a map so that the image still can be read after the map is saved to other places.
Icon Size of Link Arrow Is Set in Toolbar Icon Height
That icon size is related with Toolbar icon height in Preferences. I am not sure whether it is a bug, but I am going to report it.
You can use the old icons theme to have that small arrow. http://freeplane.sourceforge.net/wiki/index.php/Add-ons#Old_Icons_Theme
Good idea, thanks!
Thanks! The hide all works but the show all doesn't. Any idea?
I don't know whether this is the best way, but I found it work. Just select a node with details, then hit Ctrl + A to select all, and hit Alt + F2. If select a node without details first, it does not work since the function Hide details (Alt + F2) on View menu is not activated.