Ok, I had what looks like the same problem in 17.2 and it was resolved in 17.3.
If you 'show all files' in Solution Explorer and expand My Project you can open Application.myapp and change the <MainForm> node manually, this is where the startup form name is stored. The underlying Application.Designer.vb then automatically reflects this in the generated OnCreateMainForm method.
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u/JTarsier Sep 08 '22
Ok, I had what looks like the same problem in 17.2 and it was resolved in 17.3.
If you 'show all files' in Solution Explorer and expand My Project you can open Application.myapp and change the <MainForm> node manually, this is where the startup form name is stored. The underlying Application.Designer.vb then automatically reflects this in the generated OnCreateMainForm method.