How to change merge mode for eclipse egit merge tool?

We are working with Git and Eclipse. If I'm opening the merge tool to resolve a conflict I get this dialog:

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I want to change this afer I marked Don't ask again before. But just cannot find the correct preference page.

Where can I change this after the dialog does not show up anymore?

Solution

You can change this in Eclipse Git preferences. Go to Window -> Preferences -> Team -> Git and there is dropdown for Merge Merge tool content.