You can see test code coverage in Developer console. Please go through below link. https://help.salesforce.com/articleView?id=code_dev_console_tests_coverage.htm&type=0
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As suggested by Kamal that is one place to check the code coverage and one more place is DeveloperConsole asual we can see.Please find the below screeshot.
You can see test code coverage in Developer console.
Please go through below link.
https://help.salesforce.com/articleView?id=code_dev_console_tests_coverage.htm&type=0
Please like the answer and mark it as best if this helps.
If you want to see the code coverage of a class, you can see it on the top (see screenshot).
Mark this as best answer if it helps you.
Regards.
As suggested by Kamal that is one place to check the code coverage and one more place is DeveloperConsole asual we can see.Please find the below screeshot.