By default, the week view will show 3 multi-day events at the top of the grid. If there are more for the given week, those will be hidden and can be revealed with a toggle on the left side of the grid.
It is possible to change the default number with the help of the filter. The example below will change it to show 5 multi-day events.
add_filter( 'tribe_events_views_v2_week_multiday_toggle', function() { return 5; } );
Add the code snippet to the functions.php file of your theme, or use your preferred method for integrating snippets into your WordPress site, such as the free Code Snippets plugin.