Xfce x11-wm/xfce4 does not see up arrow

I feel stupid, where should I copy it please?
Not knowing isn't something to feel bad. Bad is not asking when not knowing.

But I don't know what to do with the file "x11/libxfce4menu/files/patch-libxfce4kbd-private_xfce-shortcuts-grabber.c"

It's quite easy. Have a ports tree installed. If you are using packages to install programs, and if you haven’t changed the repository in /etc/pkg/FreeBSD.conf or /usr/local/etc/pkg/repos/FreeBSD.conf (pkg.conf(5)), then the system is using the quarterly package repository. Assuming there is no ports tree present, run as root in console or X terminal:

svnlite checkout https://svn.freebsd.org/ports/branches/2020Q2 /usr/ports

If you are using ports to install programs, then run:
portsnap fetch update

After the ports tree is installed, open following link in your browser: https://reviews.freebsd.org/file/da...-libxfce4kbd-private_xfce-shortcuts-grabber.c

Save page as Plain Text Document, name it: patch-libxfce4kbd-private_xfce-shortcuts-grabber.c , then change into a console or into an X terminal, run as root:

cd /usr/ports/x11/libxfce4menu
mkdir files
cp /usr/home/fabian/patch-libxfce4kbd-private_xfce-shortcuts-grabber.c files

( Type the first characters of the file name, complete the rest with the tab key. Replace fabian with actual user name).

make reinstall

Exit and reenter xorg/xfce4 if necessary.

Thanks a lot for your beautiful answers.

I will need time to process everything, then I will post something like "problem solved" I guess.

Bon dimanche à tous.

Je vous aime!