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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 29.0.0
Operating system and version (eg, Ubuntu 20.04): Debian 11
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4
PHP version (eg, 7.4): 8.2
The issue you are facing: The calendar version 4.7.2 (as of 2024-05-07-012855-PM) inserts a default “PERSONAL” calendar.
The problem with this is that all my user’s created appointments go directly into their PERSONAL calendar.
I would like them to be able to set a “DEFAULT” calendar and/or delete their personal calendar.
I have deleted their personal calendar, yet for some reason it keeps on popping up immediately: in other words, the personal calendar never deletes.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Try and delete the personal calendar, and it will stay there.
- Try and create a new appointment, and the default calendar is the personal.
The output of your Nextcloud log in Admin > Logging:
Error jsresourceloader
Could not find resource firstrunwizard/js/personalsettings.js to load
"May 7, 2024, 1:17:59 PM"