Currently there is no such option
List could be either paginated (in which case you’ll have links to subsequet pages when list contains more than one page of items) or shown entirely on a single page
This is pre-determined by shortcode attributes, and cannot be changed as a consequence of user action
If you want to achieve this goal anyway, my suggestion is to create two wishlist pages: one should be the default one, configured in plugin’s settings, with pagination, while the other should contain non-paginated shortcode
At the bottom of first page you could add an anchor (Show all) to the other page
It is just a trick, and url will of course change, but it should work as you wanted