@nurber - yes, the 'Enter' seems to stop working when the viewer encounters a file boundary in the epub, typically these coincide with chapter boundaries.
But the 'official' Viewer keyboard shortcut for Find next is the widely used (de-facto standard) F3 key, and for Find Previous Shift+F3. See the Keyboard shortcuts tab in Viewer Preferences, double click an item to to change it.
BR
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