FAQ: Sessions For A Particular Page
How can I see only the visitors that entered at a particular page, or only the visitors that hit a particular page at some point in their session?
Use the global filters to show only sessions containing that page; reports will only show sessions including that page.
In the global filters, add a filter to show only sessions containing that page. Then return to the reports; until you remove that global filter, all reports will show only traffic for sessions containing a particular page.