Explain the problem as you see it
I installed the Tana app (Chrome) on android. There is no native way to indent or outdent a node.
Why is this a problem for you?
It is a problem because, without proper indentation, it wastes my time to reorganize my nodes once at my laptop.
Suggest a solution
Just like having buttons on the collapsed sidebar for previous and next dates, have two buttons on the sidebar for indent and outdent. This will be very useful especially when on devices with a touch interface such as mobile phones, ipads, and other tablets, etc.