If you are unable to switch users in windows 10 without restart, you can try command prompt to switch users. I can't say with confidence but may it can help you.
Just open cmd and enter "runas /user:*computer name\*account name explorer.exe" and press enter. It will switch you in your account you entered.
Source: https://windowsclassroom.com/how-to-switch-users-on-windows-10/