Frequently Asked Questions:
Correction for newer versions: the Rectangular selection tool is back along with a number of other options. There is a whole selection workspace with 8 tools and lots of functionalities.
Q: How do I open a photo for editing?
A: From Gallery view, large "+" button in top right corner, "Image" button, "Gallery" (for your default external photo browser). If you start from editor (already open project) use Options/Open command to exit to the gallery.
Note that you can also import a photo into currently open project as a layer. Yet this way you don't keep original resolution of the imported image.
Q: Everything disappeared from the screen, i only see my painting but no tools. What to do?
A: You can hide and display interface with a three-finger-tap gesture, or with with single tap on upper-left corner.