sudo paccache -r
You can read more about that here: https://wiki.archlinux.org/title/Pacman#Cleaning_the_package_cache
The other settings are for configuring the paccache.timer, which is a way of automating the process of deleting unused packages.
If you are interested, here is a discussion from last year related to using these utilities, and cleaning up systemd logs as well:
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