"Stand window" (underlight) cover - what to imagine?

Good day,
after doing some research, we are now completely clueless about what to do with our large room windows, which consist of two elements (top: a tilt-and-turn window - bottom: a fixed window [= the lawn can be seen through in the photos]).

Our goal is that you cannot look directly from outside into the rooms and, ideally, that some of the heat can also be blocked.
Therefore, we have already attached a pleated blind to the upper window (simple, since with a tilt-and-turn window frame, you can "clamp" it at the top and bottom with holding elements).

Unfortunately, this is not possible with the lower fixed window. First, you cannot clamp anything because it cannot be opened. And second, the window frame inside at the glass insert (glass bead), where the silicone bead begins, is only 1 cm deep. So you cannot attach a pleated blind with a so-called "tension foot" to the glass bead either (it always needs to be at least 1.5 cm deep).
As a temporary solution, we bought and attached some really ugly window film with suction cups, which however keeps coming off (can be seen in the photo below).

I wanted to ask if anyone has ideas on how we could now solve the problem of privacy protection (and ideally heat protection). Maybe someone of you faced a similar challenge. Or what have you done with your fixed windows?

I am grateful for any advice!

Frosted glass film? The type that you apply with water? I once used that for a fixed glass panel to place my desk in front of it.

I have a pleated blind as privacy screen in my bathroom, which is stretched in the window recess. The pleated blind can then be slid to any position:

or pulled to full height (the very top is still missing here)

I used the traditional method: Grandma's curtain rod, for which small hooks used to be drilled into the wooden frames and a curtain rod was attached to them. I have PVC windows and accordingly used adhesive hooks. It looks terrible (tasteless) when choosing, buying, and sticking them on, but with the rod and curtain it looks good. Except that I don't have a proper, nice curtain yet, more of a makeshift solution. I don't know what the curtains are called that can be mounted halfway up.

I wanted to ask if anyone has ideas on how we could now solve the problem with privacy protection (and preferably heat protection). Maybe someone among you faced a similar challenge. Or what have you done with your French doors?

- Frosted window film (also available with sun protection) - Reflective film - Pleated blinds across the entire width of the window opening - Curtains This is not a challenge; there are plenty of options. What kind of room is it? How much sun protection is necessary? How much privacy protection is needed and why?

There are also pleated blinds for sticking.