The Rafah Border Crossing is the only crossing point between Egypt and the Gaza Strip. It lies on the international border that was confirmed by the 1979 Egypt–Israel peace treaty and the 1982 Israeli withdrawal from the Sinai Peninsula. The Rafah Border Crossing can only be used for the passage of persons. All goods traffic must use the Kerem Shalom border crossing on the Israel-Gaza border.

https://en.wikipedia.org/wiki/Egypt–Gaza_border

The Rafah Land Port became the primary border crossing between Egypt and Gaza, managed by the Israel Airports Authority until Israel had dismantled its settlements in Gaza on 11 September 2005 as part of a disengagement plan. It subsequently became the task of the European Union Border Assistance Mission Rafah (EUBAM) to monitor the crossing.

In the 2023 Israel–Hamas war that began in October, the crossing was again effectively sealed. The Egyptian government refused to allow either Gazans or foreign nationals to exit Gaza via the Rafah crossing, despite intensive international efforts to secure a window of time for the Rafah crossing to open to foreigners who want to exit the Strip.

https://en.wikipedia.org/wiki/Rafah_Border_Crossing

The Philadelphi Route, also called Philadelphi Corridor, is a narrow strip of land, 14 km (8.699 miles) in length, situated along the entirety of the border between Gaza Strip and Egypt. Under the provisions of the Egypt–Israel peace treaty of 1979, it was established as a buffer zone controlled and patrolled by Israeli forces. One purpose of the Philadelphi Route was to prevent the movement of illegal materials (including weapons and ammunition) and people between Egypt and the Gaza Strip.

https://en.wikipedia.org/wiki/Philadelphi_Route

Tl;Dr: Europe, Egypt and Israel all play a part in managing that border. The only party that has zero control over this border is Gaza.