@dellaaa Your post title is neither descriptive nor helpful to solve your actual problem.
The local adjustment feature has been added after the latest 5.8 release, as you can read about here. This is why there is no mention of it on the www.rawtherapee.com website yet, it has not yet been part of an official release. Only if you search into the forum or try out a nightly build, will you find what you’re looking for. In the past year there has been continuous effort to improve the tool, as you can see from the number of closed issues on GitHub.
tl;dr Try out a nightly build: Release Automated Builds · Beep6581/RawTherapee · GitHub
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