Owntracks IOS in private mqtt broker?

Configuration
1

I have android owntracks client and can configure easily private mqtt mode at startup
Now I download owntracks IOS, but I couldn’t figure how to set private mqtt mode?
I don’t see any setting except forcing to be in public mode at startup
Am I missing something?

2

I set this up recently myself. I found it far from intuitive.
Click the ‘i’ top left, then settings. Click the word ‘Public’ next to ‘Mode’, you should then be able to cycle through the options.

3

Ahhh … hidden menu
Thank you