Why do I suddenly only have 2 tracks?!

All my other track options are greyed out?

And I can't add anything to the track lines??

Fyi they aren't locked, and there's no blue spinning wheel or offline files. 
PLEASE HELP!! ;(...

RUSH:Version 1.5.54 ( build 70)

Big Sur 11.2.3

macbook 15" 2018

2.2 gh 6-core intel core

32 gm memory

250 hard drive

138 available