This changed in version 2.0 of the mobile app. There is now no longer a way to do it within the mobile app by itself. You have to either use a routine, or add switches.
No longer Applies
For instructions with the new V3 app as of 2020, see:
FAQ: How to Change Location.Mode (new app) from Alexa (2020)
The remainder of this thread is now very much out of date.
You have to add a switch or a routine to change the mode.
I really like @MichaelS ’ new Alexa helper smart app. You can set up six momentary switches at once to change the mode.
I also added A separate room I call Mode Switches which is where i stick switches like this. So I end up with just one momentary button tile for each mode and I just have to tap that to switch to that mode. Or, I can just tell the Amazon Echo to turn on that mode.
It takes some set up initially but after that, works really well. Actually like it better than what we had in the old app.
Steps:
creat…