The bottom right corner only gives you information on the amount of memory used up until that point.  It doesn't give you a "real-time" tally of the amount of memory available.

The restart command does unassign all variables, but it doesn't necessarily purge the system's memory of its content.  That's what the gc command does.  The ?restart help page will provide more details on what exactly is reset.

The bottom right corner only gives you information on the amount of memory used up until that point.  It doesn't give you a "real-time" tally of the amount of memory available.

The restart command does unassign all variables, but it doesn't necessarily purge the system's memory of its content.  That's what the gc command does.  The ?restart help page will provide more details on what exactly is reset.