How to change size of widget image in Fortnite?

Hi,

Let me ask how to change widget size in Fortnite.
I imported a game widget .png file (778 × 168) into UEFN, and then imported again another .png file of which size is expaneded (2400 × 519).

However, widget size of the latter is not changed in Fortnite. Is there any setting in UEFN which is needed to show the expand size in Fortnite?

Regards,