Representative images of both EUI quiet-Sun observations studied in this article. Panels a and b show the visualisation from JHelioviewer (Müller et al. 2017), where the EUI/FSI 17.4 nm images overlaid with the near-simultaneous HRI_EUV images are shown. The time mentioned in UTC corresponds to the time of observation at the Solar Orbiter. Carrington coordinates are shown, the crossing of the two yellow great circles indicates the antipode of the Earth/SDO sub-solar point. The red and blue markers indicate the solar north and south poles. Panels c and d show the HRI_EUV images that cover a FoV of approximately 20° in longitude and latitude, corresponding to 215 Mm × 215 Mm on the surface of the Sun for both datasets. The detected EUV brightenings at the specific instance are marked in cyan over the respective FoVs for illustrative purposes. Movie 1 and movie 2 (available online) show the detected EUV brightenings over the full FoV for the complete duration of the two data-sequences.