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![](https://lemmy.sdf.org/pictrs/image/4ef100e2-44a6-485d-be26-51dfb6d02965.png)
Do you have the language set within the .tex document itself?
/selectlanguage{French}
Or something like that. You may need to /usepackage{babel}
as well or similar. I haven’t played around much with LaTeX, so not sure this will work or not–but everything I’ve seen indicates that the TeX document language setting is what will key the LSP language setting.
On second thought, it looks like it probably isn’t even vimtex or LSP related–probably just your vim settings. Try :set spelllang+=fr