This method works on any Mobile, Laptop, or PC.
Step1. Search for My Google account and click on the first Google link.
Step2. Login to your account
Step3. Click on Security
Step4. Scroll down to Third-party apps with account access.
Step5. Click on Manage Third-party Access
Step6. Here! You can find all sites and apps to which you permitted them to access your Google account.
Step7. Click on the app/site which you want to remove. Click on remove access. Click OK.
Step8. Now! If you want to remove sites/ apps which use your account for signing
Step9. Scroll down to Signing in with Google. Here! You’ll find all sites/apps which use your Google account for signing.
Step10. Remove access.
That’s how you can remove third-party apps from accessing your Google account.