No application present in the "Edit level in external application" window

Hi, I do not understand why no application are present in the “Edit level in external application” window…

How can I add the applications with which to modify the work?

Thanks in advance.

MacOs Monterey 12.3.1

MyPaint 2.0.1

Operating System + Version: 12.3.1

Make and Model # of Graphic Tablet:

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