Reconfiguration of loops substructure. Top: Subfield of the 2022 April 1 data set observed by HRI_EUV (located in the bottom right of Fig. 6). A loop bundle is seen (inverted in this figure in order to have the apex on top), where a large-scale reconfiguration is observed. Bottom: Time–distance plot across the apex of the loop (dashed white curve in top panel), revealing a downward (inward) motion of many loops (akin to contraction), indicated by the black arrows, accompanied by transverse oscillations. The time of the snapshot in the top panel corresponds to the vertical white dashed line (see Sect. 3.1.7).