About the anaconda installation location and current directory

The C UUsers ユーザUsername> displayed is only the Working directory and is different from where it was installed.

• Is it irrelevant to where anaconda is installed with this notation in anaconda prompt?
• anaconda is installed in drive D, but is it correct to understand that the directory you are booting to is in drive C?

I think they are all correct.
In detail, it should be "the home directory of the user you want to run."

If you right-click anaconda prompt in the start menu, right-click to open the other file location, and right-click to display properties, the Work Folder should be %HOMEPATH%.

If you change the destination drive or folder (or if the installation is "all users"?), you probably won't change the %HOMEPATH% shortcut.

"If you want to change it, you can change the ""Work Folder"" of those shortcut properties."

For example, these articles explain it.
Change the Anaconda Prompt Work Folder
Anaconda/Python:Change Anaconda Prompt User Path

Other things like jupyter notebook, jupyter lab, etc. will be changed in another way.

[Change Jupiter notebook initial folder] 4 check points when not possible
Change the Jupiter Lab Work Folder

The configuration file name seems to have changed since jupyter lab 3.0.0.

How to Specify a Launch Browser for JupiterLab 3.0