The first screenshot showing the Apple SSD is fine it is just showing the capacity of the disk is 120GBS, it does not mean it is full.
On your second screenshot you have highlighted the Macintosh HD and you can see the usage of the disk in it various categories as well as the free space.
The thing about the macs storage display is that it is almost always wrong and has been like this for years.
One way to check is by rebuilding the Spotlight index.
How to rebuild the Spotlight index on your Mac – Apple Support
Move the Macintosh HD (or the name you gave your disk) in to the Privacy panel.
Quit System Preferences.
Open System Preferences> Spotlight> Privacy highlight Macintosh HD and press the minus button.
The mac will start rebuilding the Spotlight index.
Check by clicking on Spotlight in the menubar and enter word, if it is indexing you should see a progress bar.
If re-indexing has not solved your problem then run this app, https://www.omnigroup.com/more
this will give an accurate account of the storage used. When the app has created its overview you can look at
the Users folder in the output and see what each user has stored, you can then delete files from there.
Do not delete any files or folders in any System or Library folders or any files you do not understand.
Grand perspective may look impressive but is it really helping.
I prefer this free app to accurately show exactly your disks usage,
https://www.omnigroup.com/more
its not pretty but it works and is easy to understand.
