Hello @PATIL Purna (SAFRAN) ,
Thank you for taking time to post this issue in Microsoft Q&A forum.
Try this => open VS Code, close all pages in VS Code(include the welcome page) => click Manage icon(on the bottom left) => Settings => search "startup" => select Workbench => set "Startup Editor" to none => close VS Code, restart your machine and check again.
As Visual Studio Code(different from Visual Studio IDE) is currently not supported in Microsoft Q&A forum, if above method doesn’t work, please kindly post this issue on Github - vs code for better help.
BTW, I can reproduce this issue. Every time I restart my machine, and open Visual Studio Code for the first time, the language shows incorrectly. I don’t think that you miss any steps or configurations. On my side, after doing above changes, it works. After that I change the settings back, but I don't get the same issue anymore. I strongly recommend you report this issue to Visual Studio Code team and double confirm with them if this is a potential issue.
Thanks for your understanding, happy coding!
Tianyu
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