I wish that I could find the picture where a designer handled a situation like this. She actually installed something like a bamboo Roman shade at the same height as the curtain rood, and had the shade pulled own just to the top of the window glass. Then the curtain panels hung at either side of the window.

It made it look like the entire window was that tall, as you couldn't see through the bamboo shade to see that there was wall behind it. FOUND IT! All of the below is from here - https://cotedetexas.blogspot.com/2009/08/top-ten-design-elements-4.html

BELOW -

DON’T: Real house: this is a problem window – the arched transom
really adds nothing to the design of the window – I would have ordered
just one long blind and put it right under the ceiling rod – and raised
it just to the top of the door for access in and out. Instead, there is
too much going on in this window. Too many different window sizes, too
many little shades, and the curtains are just a tad too short – this
should have been fixed during the installation – the drapery pins could
have been moved up just a bit. It’s not easy folks!

An open question to mass builders of Mac Mansions: Why do you
install lots of little windows like these? What’s with the arched
windows everywhere? I understand Palladian windows, but these sir, are
no Palladian windows. Why bother pretending they are? Wouldn’t just a
taller French door been so much prettier here than the short door given
the Palladian treatment? Just a question.

DON’T: Real house: the same designer as above almost gets it right
this time. The blinds and drapes are placed perfectly – but, but, but –
if you are going to lower your textured shades – add a lining to them so
you don’t get the invisible shade look from the glare! And don’t put
the shades down at all different heights. The designer could have bought
just one long shade with a blackout lining – why buy three, unless it
was to save the money of a custom shade. If possible – one shade is
better than three little ones. And one more detail that should drive a
good interior designer to distraction – notice how the two middle panels
“break” at the floor – yet the right panel just barely meets the floor.
Which was the intended length – the breaking length or the just barely
touching length? A good installer might have been able to correct this.
If not – it should have gone back to the workroom for correcting. I
wonder, did the designer not notice this? And just one other detail –
notice that the panel widths are not uniform – the width of the middle
panels are doubled, yet the right and left are single. Why? The panels
really should be the same width if at all possible otherwise it might
look unbalanced.