Zoanoid
Taking screenshots in Incognito mode in Chrome on Android is generally disabled by default to protect privacy. However, you can change this setting by adjusting Chrome’s flags. Here’s how you can enable screenshots in Incognito mode:
Open Chrome on your Android device.
Type chrome://flags in the address bar and hit enter.
Search for “Incognito Screenshot” in the search bar at the top of the flags page.
Find the flag named "Incognito Screenshot".
Change the setting from "Default" to "Enabled".
Relaunch Chrome by clicking the button at the bottom of the screen.
After these steps, you should be able to take screenshots while in Incognito mode in Chrome.
https://support.google.com/chrome/thread/274726506/how-i-can-enable-screenshot?hl=en