Answer
So, if you want to change it, you need to switch off the multiple sign in function from each account, then start over from your preferred account. To switch it off, go to the settings button in the top right corner, then account settings. You will see multiple sign-in = on with an edit button next to it.
You’re Doing it Wrong! How to Manage/Toggle Between Multiple Google Accounts
How To Change Default Homepage In Google Chrome
How do I remove the default account from Google Chrome?
So, if you want to change it, you need to switch off the multiple sign in function from each account, then start over from your preferred account. To switch it off, go to the settings button in the top right corner, then account settings. You will see multiple sign-in = on with an edit button next to it.