Changing administrator ID on new MacBook Air & MB Pro & limiting communication between 2 laptops

Thank you John Gait for your 1/31/22 reply. I didn’t want to implement you recommendations until I had thoroughly studied & understood  this material. There was a lot of articles I had to read. Additionally, in late February, I experienced some serious problems with my email account access that AT&T support completely messed up, changing pass words, locking me out several times, that made me very hesitant to approach major changes on the laptops. Then it’s tax time which has been another headache. Anyway, both devices are basically functional, with these minor annoyances of crossover data, etc. 

I have one more Q. before I start this laptop separation. First, let me summarize the situation. I’m using the new Mac Air (2020), my wife will be using my old MacBook Pro(2015), & we’re going to retire the much older MB Pro(2011) she had previously used. Initially, Both laptops had my wife listed as the Admin, as I transferred data & settings from the old MB Pro to the new Mac Air. I managed to change my user status on the Air to Admin, & my wife’s Admin to standard user. After I log in using her account, In Sys Pref, however, under Apple ID, then name, phone, email, all the information  listed is mine. In the Activity Monitor, however, my wife’s name is listed as the user. This is where I’m confused. If I sign my wife out of her user account, with my name listed as the Apple ID, will this cause any problems with my actual Apple ID account on the laptop or online in the iCloud? Thanks for any reply.

Victor