Logging out of WhatsApp Web is a must to prevent other people from accessing your account, especially if you are using a shared computer.
Following are two easy ways to log out of WhatsApp Web.
#1 Log out of WhatsApp directly on the web
From the WhatsApp Web view, click menu iconthen select Log out (Go out). Immediately the WhatsApp account was removed. This method can also be used on WhatsApp Desktop.
#2 Exit WhatsApp Web through the WhatsApp application
1. Tap the menu icon, then select WhatsApp Web (Linked device).
2. Select the device you want to eject.
3. Tap Go out.
If there are many devices connected, you may tap Sign out of all devices to log out at once.
The two methods above have the same function, but the exit method through the WhatsApp application provides extra certainty because only you can control it.
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See also how These 5 simple tips can make WhatsApp anti-tapping.