Hello @C V ,
Welcome to Microsoft Q&A forum.
Tab Order may not work for VS 2019 with .NET Core 3.1. See this thread: Tab Order not working and this blog: Features yet to come and phased out Features for details.
I suggest try to update VS 2019 to the latest version and check if Tab Order works. If it still doesn’t work, then I’m afraid you may try to use VS 2022 to use this Tab Order feature for .NET Core/.NET project.
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