Cura 3.6 There is no rotate button in the left-edge buttons. I've seen installs on other computers and the button is included, mine is missing. I had the same problem in Cura 3.4.
System: Win 10 home, Version 10.0.17134,
Processor AMD A8-6500 APU with Radeon(tm) HD Graphics, 3500 Mhz, 2 Core(s), 4 Logical Processor(s)