Perform some PC health checks with malwarebytes etc. Most likely went on a malicious website and has changed those settings. Also check manage search engines to see any unfamiliar search engines. It boils down to your personal preference. On the main page check 'Search' and see if its selected as Google. Note: In Step 3 above, you'll see several options in the drop-down menu they all work similarly, simply switching up the colour models available. At the bottom, hit the Relaunch button to restart your browser.Go the drop-down menu next to Force Dark Mode and select Enabled.This will bring up a hidden Chrome settings menu and the Force Dark Mode option.Enter the following address in your URL bar: chrome://flags/#enable-force-dark.If you want to change the appearance of web content, in effect forcing light coloured web pages to show a dark background and white text, follow these steps How to force dark mode for Chrome web content However, this will only affect the browser's interface and menus. Changing this to Dark enables dark mode on all apps with native support, including Chrome.Enter the Windows Settings menu, click Personalisation then Colours and scroll down to the switch marked Choose your colour.Pocket-lint How to enable dark mode for Chrome on Windows 10

Google chrome boxes under search bar