How can I show the week numbers in the calendar shown at the top in GNOME Shell?
If you have dconf Editor, launch it and navigate to /org/gnome/desktop/calendar/show-weekdate. Then disable Use default value and set Custom value to True.
Alternatively just open Terminal and run
gsettings set org.gnome.desktop.calendar show-weekdate true
You can do that with the GNOME Tweak Tool.
sudo apt update
sudo apt install gnome-tweak-tool
Open the application after installing it.
Go to the "Top Bar" menu item from left.
There's an option called "Show week numbers". Check it.
