You may not realise that the QuickShape tool allows you to make a rectangle that is far, far more versatile.

Create a QuickShape with four side and 0 deg rotation you have a rectangle!
If you right-click select Xara even tells you it is a Rectangle in the Page & Layer gallery. It is not. It is more; it has the full features of a QuickShape.
Change your tool selection to QuickShape and you can round corners (like a rectangle) but you can stellate and even drag the edges to an new shape.
Or even click the Create ellipse button. Xara now tells you it is an Ellipse in the Page & Layer gallery.
Or change the number of sides. Xara will tell you it is a QuickShape in the Page & Layer gallery.

If you try to Fill with an image, all the functionality goes away.
All is not lost.
I make my QuickShape black and overlay my image with a Bleach transparency and soft-group.

All the fun of the fair,
Acorn