Logic Pro X What limits the amount of Virtual Instrument Tracks?


When I try to add more Software Instruments, the INSTRUMENT tab is blurry. When I double click, expecting to see the 'chosen' Inst. Face page, but nothing happens. Does this mean I can't add more tracks? I have about 1.5 TB of memory free. Do I need to assign more memory to LPX somewhere? thanks 4 reading!