Following
How to create a desktop icon on Ubuntu or Debian based systems
I created
[Desktop Entry]
Version=1.0
Name=Isabelle
Comment=The Isabelle Theorem Prover
Exec="/home/user/Isabelle2022/bin/isabelle jedit %U"
Icon=/home/user/Isabelle2022/lib/logo/isabelle_transparent-128.png
Terminal=false
StartupWMClass=Isabelle
Type=Application
Categories="Theorem prover"
MimeType=text/thy
in ~/.local/share/applications/isabelle.desktop
.
But even after logout the icon did not appear on my desktop.
How should I fix this?