Accessing information in the Library of older computer backup

Due to beach balling on my Mojave iMac I had to wipe it and reinstall the OS and it is working MUCH better -- I not only had a TimeMachine backup of the old drive but also two SuperDuper backups as well.

I need to get a few things from the user Library of the old drive == but TimeMachine running in the new machine won't go back that far. And when I boot into the old drive using the SD Clone it acts as it did before = beach balling even in System Preferences. So I am having the devil of a time getting things from the Old library which I would like/need.

I did not do a Migration or any such because it was not clear what was the issue and the new bare install is working fine. But how do I access what I need on the old drive when Library is a hidden folder ?