Hi Neil,
This is Wil, one of the independent advisor, an expert with Windows 10 and a fellow Windows 10 user like you. I understand your concern about the Switch account option in start menu.
There is no "Switch account" button in Windows 10. To switch accounts on Windows 10, you would just need to click on the start button and click on the account picture and click on the account that you want to switch to. You may click on this link for reference. https://support.microsoft.com/en-us/help/402670...
I hope the information I provided will help you. If you need further assistance please do reply back and I will respond as quickly as possible. Have a nice day.
Thanks,
Wilfred P.
Independent Advisor