I have a problem with Visual Studio. Help me

[ProgramEnginer]

Hi, I'm creating a big project in Visual Studio. But I have a problem. My problem is that even though I changed the startup, the same startup page still opens. I deleted the startup page that opened, but that deleted startup page still opens. My project is incomplete. I use Visula Studio Enteripse 2019 under license. That is, there is no crack. I did not understand that the program made such a mistake. Please help me.

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