The feature currently exists behind a flag and works as intended after flipping the switch. Once enabled, you can capture screenshots in incognito tabs as you would usually do in regular tabs. To test out incognito screenshots on Chrome, open Chrome Canary, and visit chrome://flags. On the page that appears now, search ‘Incognito Screenshot’, and enable it. After enabling the flag, restart the browser, and you are all set to take screenshots in incognito mode.
In case you’re wondering, the captured screenshot will retain incognito mode’s symbol. This way, others will know that you took the screenshot in incognito mode. It is trivial but something you should keep in mind in case you’re planning to share the screenshot with others.
While it is good to see that the flag has made its way to Chrome Canary, you will have to wait to get this feature in the stable version. If everything goes according to the plan, we could soon see this handy feature reach users with Chrome 88. Until then, you can use the feature on Chrome Canary. However, do note that you might run into bugs as Canary builds are experimental and tend to be unstable. Download Chrome Canary (Android)