Windows Spotlight suddenly decided to use Thai language instead of my system setting (US English). How to fix this?

The image presented by Spotlight appears to be taken in Thailand. For whatever reason, this changes also ANY language that appears together with this very image on the lock screen, despite none of the system settings being set to Thai. Note that the language of the screen where you are asked for the pin or may choose other sign-in options is always in the correct language (in my case: English). We are talking only about the Spotlight screen and the language of the text there (typically a box in the top left and a box in the center of the screen) being in the wrong language.

So, to summarize:

* The fixes suggested by Johann do NOT address the root cause of the problem, as the Welcome screen language never was set to Thai and everything that isn't Spotlight is in the correct language. This can easily verified by changing to e.g. a picture only lock screen.

* It appears that Windows Spotlight tries to be super smart and changes language based on image location, ignoring any system settings for the Spotlight screen.

Suggested workaround: Disable Spotlight and switch to picture only lock screen

Suggested fix: Enforce Spotlight to keep the Welcome screen language regardless of the content shown

I have the same problem, this is a serious issue. First I though it's a virus. I've taken all these steps the language is still in Thai.

I have same issue. Windows and all lang settings I have in Czech. Only lock screen showing in thai. Even when I click on more info for picture it is opened bing with link in thai lang.

Solution or better workaround worked for me - on right top side of screen you could "vote" that you do not like picture - then picture is changed - and the new one is finaly in english...

I think I might have got the exact same image with the exact same issue. As you can see from the screenshot below, the system messages (date, time, etc.) are all in English, the image was taken in Indonesia, and the Windows Spotlight messages are in Finnish for some inexplicable reason. (No Finnish language pack or keyboard pack has ever been installed on the afflicted machine.)

I clicked on the "Not a fan" option to force an image change, and ended up with a different background picture (this time from France), but the Spotlight messages were still in Finnish:

It's worth noting that I first noticed this right after I allowed the relevant machine to update itself, so my first instinct was that the update broke something. Unfortunately, I didn't bother to take a look at precisely what the update included, so I can't really even guess if it might be related. Another possibly relevant detail is that my preferred system language and physical region of residence do not match, and it sounds like that applies to at least some of the other people reporting the same issue here. (And for the record, my region is not Finland, either. In fact, I'm in East Asia.) Strangely, the affected machine is the Surface that was issued to me by my employer, and that machine runs Windows 10 Pro. My Windows 11 PC at home had not (at least not yet) exhibited any such symptoms, despite receiving an update around the same time. So either this glitch pops up quite randomly, or it only affects some subset of Windows 10 machines.