Actually, me too! But it's typical of when Academia meets Technical and vice versa. Folks in Academia cannot resist speaking 'edugeek' (that's meant to be an 'endearing' term ... like 'mavens' the other way!)
Sometimes an important technical clue is seen in a screen shot ... which, in this case has led to an Academic explanation - not a technical one. Ok, my fault ... won't do that again, believe me ... not with this OP!
From what am able to gather ... here's the OP's situation.
OP's UNI server ... UNI appears to be (at least the one I found via Google which could be incorrect).
Moodle 3.8.x ?
Server: Apache/2.2.3 (CentOS) ?
X-Powered-By: PHP/5.5.15 ?
With categories of courses for Spring/Fall 2020 - not separate domain named servers ... same server ... same Moodle.
OP's home server is Linux Mint
Really a Ubuntu based workstation OP running as a server at home.
and Linux Mint folks say getting closer to Ubuntu 20.04
Operating system and versions (linux/php/mysql(Mariadb) make a difference.
Documentation for how 2 in Linux Mint isn't same as CentOS
When it comes to a moodle server there are really 3 administrators.
1. operating system administrator .... installs/maintains AMP stack
2. DB administrator - inside the DB daemon
3. Moodle app Admin
Shown above is really in order ... #3 depends upon persons who wear
the #2 and #1 hats.
On OP's home Linux Mint server, *you* (the OP) wear all hats!
So strongly suggest, when OP post a question, disclose which
server and remind those who might answer about operating system,
php version, mysqld/mariadb version as no 'volunteer responder' is gonna keep track of OP's stuff - let alone Academia according to ?
Am sure this will add to the confusion ... despite my attempt to explain.
I, like you Howard, really don't have time to 'muse', 'guess', etc. in attempting to translate Academia -> Technical and vice versa Technical -> Academia.
My 2 cents!
'spirit of sharing', Ken