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It is really not about "I do not want...". I simply do not know. I've already spend many many hours on this problem and as you see, no success so far 

I am not a developer. Therefore, I only have observations.

I have installed the app Thermal Guardian from Samsung.
There I have activated: "Limit CPU Boosting when heating".
I have disabled : "Decrease maximum brightness when heating".
--> No success

The display gets darker on LM4 immediately after startup. Without further use.

I have the feeling that the call of a function directly after start is responsible for it. A function that is started at LM4 but not at LM3.
Are there any differences in the API between LM3 and LM4 ? Is the SDK the same ?

In my case devices with Android 8 have the same problem. So it should be a function, API, SDK that already existed in Android 8.

Samsung darkens the displays in heat. But my Samsung S7 with Android 8 does not have this feature. The display remains bright even in heat.
The display still gets darker right after starting LM4.
Only my old S5 with Android 5 does not darken.

A long answer from you is also not necessary. I am not a developer anyway.
I rather hope for a new perspective on the problem. Time is precious.

However, I hope for a "long" support of LM3. After all, I am still very happy with LM3. Maybe the problem will be solved sometime.

I studied the (German language) Android forum entry and it shuts down the (partially emotional) Locus related discussion once and for all.
It is Samsung's strategy to cope with overheating and their approach, controlled by two hidden switches.

First of all, many thanks to jonny.jlue for your tip.

I made the changes and my S 21 stays bright.

So far so good. But it's not that simple after all. The general question, why LM 3 no and LM 4 yes, is not answered by this.

During my two-hour bike ride yesterday (outside temperature 25 degrees and full sun) I measured the battery temperature with both LM 3 and LM 4. In both cases the temperature was identical between 34.4 degrees in the shade and up to 39 degrees in the sun.

I read in the forums a few weeks ago that Samsung generally darkens from 35 degrees, other manufacturers only from 50 degrees.

So why doesn't LM 3 darken?

But I don't invest any more time in answering this question. I had already bought the Oppo cheaply used and am very satisfied with it and the LM 4.

Hi,
I just found this entry in an Android help forum:
https://www.android-hilfe.de/forum/samsung-galaxy-s22-ultra.4041/maximale-helligkeit-bei-sonneneinstrahlung-erzwingen-temperatur-limit-deaktivieren-how-to-no-root.1004285.html

I tried it (with google maps) ... and it seems to work.
Display remains bright ... 👍

One additional question. Did anyone try if "dark mode" or "light mode" set directly in the Locus Map 4 settings make a difference?

"Light Mode" or "Dark Mode" make no difference.

I've also found a topic on XDA with probably the same issue. One suggestion was to disable animation in the device, so maybe you should give it a try.

Thanks for the link. But there Huawei cell phones are affected and they do not cause problems in Locus.

Regardless. I turned off animation in developer options. Then I set the animation to 0.5x. No effect.
The option "under sunlight" does not exist on Samsung.

Thanks anyway.