.bookgrid_rowroomname{display: none;}
=== Hide a certain column in the BOOKINGS BOOKING LIST Table ===
.pagetypebookingslist .bookingtable tr > *:nth-child(X) {display: none;}
.pagetypebookingslist .bookingtable tr > *:nth-child(10) {display: none;} will hide the tenth column which is 'Email'.
=== Hide cancelled bookings in the BOOKINGS BOOKING Table ===
.bookingtable .cancelbooking {display:none;}