Many individuals have numerous Google accounts, which they use for Gmail and other things. Google makes it extremely tough to sign out of only one account at a time. If you know where to search, it is feasible.
When you’re signed into several Google accounts, the only choice in the accounts menu is “Sign Out of All Accounts,” which is quite inconvenient. Why should you only be allowed to sign out of all or none of your accounts? We’ll demonstrate how to accomplish it.
That’s all! As you can see, this is not a great solution. Essentially, you must constantly be signed into your account on one of your devices. One workaround is to check in to the account in incognito mode on a different device. It’s an odd approach, but it works if you want to avoid signing out of many accounts at once.
Source:
https://www.howtogeek.com/727595/how-to-sign-out-of-gmail-2/