Currently, LF2 does work as a typical projector via an HDMI connection, however, the main functionality of the LF2 is projection mapping.
Once you plug in the HDMI, it should automatically use that source, however, if it does not, you can change the input by using the Projector menu.
With the latest firmware release, you can use your remote to open a new projector menu, now with basic keystone correction, projection modes, and more.
Update the projection mode by clicking on "Picture" in the projector menu" or by going to the control page in Lightform Creator to change the projector mode (front, rear, etc.) to invert the image accordingly. See here:
You can see the full specs here https://lightform.com/lf2#specs.