Hi Marc,
The Info Panel, shows HDD space. This is the free HDD/SSD space off the drive on which you chose your working directory.
When APP is started, this shows the free space of the drive on which APP is installed. If you select a working directory on another drive, it will show you the free space off that drive. You should be able to work on a fast external drive or network share without problems.
The mem info is about your your free/available RAM. The OS is free/available RAM to the Operating System. Which is usefull to see if your OS can still do it’s tasks…
So HDD freespace is totally not connected to the memory information.
Possibly the numbers are different in APP when compared to the number the MacOS system gives you.
APP calculates everyhing as in 1MB = 1024×1024 bytes.
Let me know if this makes sense ;-)