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Because of playing around with some configurations I have a lot of unused but installed packages.

Can I list them somehow to know which ones I can uninstall?

The important point here is that not all packages are loaded at start. Some are loaded on demand via use-package.

There is a M-x package-autoremove. This does not take care that some packages are loaded later via use-package. And there are also packages listet that are definitely in use: e.g. use-package, swiper, eglot, ... I also tried to use swiper and open a py-file (because of eglot) but the list that package-autoremove offers me does not change.

Maybe there is a way to tell use-package globally once to load everything and than do package-autoremove?

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You can make use-package load everything thusly:

(setq use-package-always-demand t)
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  • The list becomes shorter then but there are still packages that are definitly not "unused": e.g. swiper, eglot, use-package, org-roam-ui, company. Even after package-refresh-contents and opening a py-file and using swiper the list does not become shorter anymore.
    – buhtz
    Mar 14, 2022 at 8:49
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    Some of these packages may have been installed in such a way that emacs thinks they are "dependencies". The source of truth is the variable package-selected-packages: if a package is not listed here and is not a dependency of a package listed here, then package-autoremove thinks it is fair game for removal.
    – Fran Burstall
    Mar 14, 2022 at 12:47

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