Actually DiskUsage does work on the internal storage, but it may mislabel it as "Storage Card". This is because of a historical decision Google took almost a decade ago that "/sdcard" would point to the user-readable part of the internal storage (to avoid breaking old, badly-coded apps. Google would have saved a lot of confusion and had a cleaner system if they'd just forced those developers to update their apps, but Google make many bad decisions...). My phone doesn't have a microSD card, and the app works fine for me.
But OK, those shots seem to show us something. You have a /data partition of 108 GB, also addressable as /storage/emulated/0. That is where your data live, but also apps' private data, apps themselves and updates to system apps (the original system app lives in the /system partition). I don't know what app you used, so I can only guess at the interpretation of some parts of those plots. But it looks like whatever app it is can only see about half of what's using your storage. The obvious guess there is that the rest is apps and their private data (it's obvious that your system menu was being misleading when it said Apps = 0 MB), as the other member said - my disagreement there was that social media alone could account for this, not that apps might not be responsible for a lot of it. So it would be worth going into System > Apps (I think Samsung rename that "App Manager", or at any rate they used to) and seeing which are the big storage users. This used to be easy, as you could tell it to sort apps by size, but Google have made it progressively harder (on Android 11 the size it shows before you click on the app doesn't include the app's cache, so may underestimate storage use by hundreds of MB per app. As I say, Google make many bad decisions). If you find apps that you don't need and which are using a lot of storage you can remove them. If they are pre-installed apps you won't be able to remove them but you can (usually) clear their storage, uninstall updates and disable them (the system should stop you disabling anything really important - though I've known Samsung use that to protect pure junk apps that they bundled as well...).
I'm hoping that will deal with some of the "missing" storage, i.e. space that is being used which doesn't show in those plots. Then there's the rest, which I think is an analysis of the files in the part of your internal storage which you can browse with a file browser. It looks like 22GB of that is in the "Android" folder, which is actually also app data of different sorts - I don't recommend deleting stuff from there manually (even if it will let you), unless you can see that there is stiff left behind by apps that have been uninstalled, because it's likely to break apps. Better to manage such things through the system settings. After that it seems that AutoDesk is your biggest single user. I don't know whether that app can show you information on the unlabelled parts of the diagram. But it seems likely that you have some folders in your internal storage that are using a fair amount of space, so it's worth checking whether any of them are unneeded (when an app creates a folder in the internal storage it is usually not removed when you uninstall the app).
I'm usually reluctant to recommend cleaning apps, partly because most of them are scammy adware and often contain features that are detrimental (e.g. task killers, which claim to speed the system, free up RAM, improve battery performance, etc, when they actually slow the system and use more energy, and the idea that you want a lot of free RAM is a gross misunderstanding of how the operating system works). But there is one I'll sometimes recommend looking at, called SD Maid. That has features for identifying data that have been left behind by apps that have been removed, which may be useful. But use it with extreme care: it may well offer to clean up stuff that you don't actually want to remove, so I'd always check item-by-item before allowing it to do anything. But even if you don't allow it to remove anything itself and just use a file browser it may help you identify things or give an idea of the scale of any issue.