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I now have new version of RX 10.4 (Delphi 10.4.2 Sydney Community Edition) installed alongside the 10.3.3. Now when I compile my applicatie {10.3) the following error appears after starting application : Error reading Page1.MirrorMode: Property MirrorMode does not exist ?????    My question is why is this and how can I fix it. Maybe it comes with install 10.4?

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This may be because 10.4 has introduced "MirrorMode" and you changed/saved the form in 10.4.
If "MirrorMode" does not exist in 10.3, you would get that kind of error.


But - why would you switch back and forth between versions for the same forms?
The only safe way is to stick with the latest version you have access to.

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