As I looked for a way to start the shower I focused on the spot but there was no pull up or other evidence of someway to start the shower. I focused then on the actual faucet controls. There was the usual OFF and C and H. You can see under the control is a black arrow looking mark with what is hard to see tub-lo and low-shwr. As I looked at this I couldn’t determine if this was for the actual flow control or if there was another control element I was missing. After careful inspection I found what appeared to be the lever. It was located on the right side and I have included a better picture below.
This was just another example of how something so basic that most people use everyday can be made difficult by design.