How to Change the default admin profile

I had a clean install of Windows 11, this is the first time I have had a machine with Win11 on it. The machine set up with an Admin account on it. Later, I transferred all my files and documents to the machine successfully under my username 'Dad', but now of course if I click 'Documents' in File Manager, it takes me to the Admin account where there are no documents. Ideally, I would prefer that the 'Dad' account was the default admin profile, and that all the defaults pointed to that instead of the already-existing 'Admin' account. How would I go about this, please?