Is there really a right film for the Huawei P20 Lite?

I own the Huawei P20 Lite. When I ordered a case, I saw that there's a film included. But when I had the foil on it, there were "air edges". So I ordered a slide that sticks only up and down (a bit on the sides, with some glue, ka) but then had to find out that the part that covered the Notch, unfortunately also partially covered the screen. Besides, the hole for the notification LED did not fit. So I ordered the next slide. I was satisfied with that for about two weeks. The film had an oil that sucked under the "air edges". Thus, the "air edges" were gone. But they came again. So I used the oil again. They were gone and caged again. And that just does not look pretty.

Now I wonder if there's actually a good matching film for the Huawei P20 lite, which leaves no "air edges", and is not too big or too small.

I hope someone can help me. I do not always want to buy new slides all the time.

The problem is that there will not be a perfect foil, because on the one hand it will be so damn hard for the consumer to position the foil exactly on the edge of the display and on the other hand the display would be built so perfectly to the edge, that hardly the display ends up bulging which also makes it more difficult.

I can only recommend you to apply a liquid glass foil, because then you will get no bubbles